# Yi Yi (SYN) - A professional manufacturer of membrane keyboard switches, flexible printed circuits and flexible aluminum heaters.
> Yi Yi is expert in manufacture of membrane keyboard switches, flexible printed circuits, rigid-flex board, el panels, silicone rubber keypad and name plates. We have acquired the skills and technology necessary to produce top-quality products that are suitable for use in computers, instruments and other electronic and electrical goods.

## Homepage
- [Yi Yi (SYN) - A professional manufacturer of membrane keyboard switches, flexible printed circuits and flexible aluminum heaters.](https://www.yiyisyn.com.tw): Yi Yi is expert in manufacture of membrane keyboard switches, flexible printed circuits, rigid-flex board, el panels, silicone rubber keypad and name plates. We have acquired the skills and technology necessary to produce top-quality products that are suitable for use in computers, instruments and other electronic and electrical goods.

## Company
- [Company Profile | Top-Quality Waterproof Keypads Manufacturer - YiYi Enterprise Co., Ltd](https://www.yiyisyn.com.tw/en/page/company-profile.html): Guided by a belief that electronics products would become an essential aspect of everyday life in both business and private endeavors, YiYi Enterprise Co., Ltd was founded in 1974 with a medium-sized capital investment, but large-sized devotion to bringing top quality products to customers at affordable prices.

Today, we specialize in manufacturing membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates. We pride ourselves on our ability to incorporate the skills and technology necessary to produce top-quality products that are suitable for use in computers, instruments, electronics and electrical goods. We attribute the excellent reputation we've developed in our industry to our experienced R&D departments, our ability to process OEM and ODM orders, and the advanced capability that are large production lines provide.

Due to the fact that we own and operate our two factories locally in Taiwan, we are able to ensure our customers that thorough inspections are carried out at each stage of production as part of our quality assurance policy. Every finished product is fully assessed before delivery, and all of our materials and components are RoHS compliant.

Our commitment to continual excellence and top level quality and service has not only allowed us to develop strong and enduring relationships with our partners and customers, but has also enabled us to develop a reputation in our industry as a trusted leader among our peers and clientele. YI YI is high-quality Company Profile, 45 Years of RD Experience manufacturer from Taiwan since 1974. With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.
- [Privacy Policy | Top-Quality Waterproof Keypads Manufacturer - YiYi Enterprise Co., Ltd](https://www.yiyisyn.com.tw/en/page/Privacy_Policy_Statement.html): Yi Yi Enterprise Co., Ltd. respects the privacy rights and interests of each customer. Yi Yi Enterprise Co., Ltd. will observe the principles when processing your personal information fairly and lawfully. We take the protection of personal data very seriously. We want you to know when we are storing your data, what data we are storing and how we are using it. YI YI is high-quality Privacy Policy,  manufacturer from Taiwan since 1974. With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.

## Products
- [YI YI high performance Membrane Switch, Membrane Switch Keypad, Graphic Overlay, Printed-Aluminum-Plates, FPC, Flexible Printed Circuit, Silicone Rubber Keypad, Rubber Keypad, PCB, EL Panel, Printed Circuit Board manufacturer from Taiwan | Yi Yi Enterprise Co., Ltd.](https://www.yiyisyn.com.tw/en/category/index.html): YI YI is a Taiwan high performance Membrane Switch, Membrane Switch Keypad, Graphic Overlay, Printed-Aluminum-Plates, FPC, Flexible Printed Circuit, Silicone Rubber Keypad, Rubber Keypad, PCB, EL Panel, Printed Circuit Board manufacturer since 1974.  With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.
- [Waterproof Membrane Switches | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-Membrane-Switch.html): Source waterproof membrane switches with IP65, IP66 or IP68 options, PET membranes, metal domes, LEDs and custom adhesives from Yi Yi (SYN).
- [Custom Graphic Overlays | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-Graphic-Overlay.html): Yi Yi (SYN) produces custom PET and PC graphic overlays with silkscreen printing, embossing, surface finishes and 3M or TESA adhesive options.
- [Flexible Printed Circuits | Yi Yi (SYN) FPC Manufacturer](https://www.yiyisyn.com.tw/en/category/CAT-Flexible-Printed-Circuit.html): Yi Yi (SYN) manufactures flexible printed circuits with single/double-sided, multilayer, and SMT capabilities. Temperature-resistant FPC for automotive.
- [Silicone Rubber Keypads | Yi Yi (SYN) - Industrial Grade](https://www.yiyisyn.com.tw/en/category/CAT-Silicone-Rubber-Keypad.html): Yi Yi (SYN) manufactures custom Silicone Rubber Keypad for electronic and industrial applications.
- [Rigid PCB Manufacturing | Yi Yi (SYN) - Multi-Layer Boards](https://www.yiyisyn.com.tw/en/category/CAT-Printed-Circuit-Board.html): Yi Yi (SYN) manufactures high-quality rigid circuit boards up to 24 layers with immersion gold finish, metal dome switches, and customizable specifications.
- [Waterproof Keyboard & Mouse | Yi Yi (SYN) - IP 65 Rated](https://www.yiyisyn.com.tw/en/category/CAT-Keyborad-Mouse.html): IP 65 waterproof keyboard with antimicrobial coating. Heavy-duty, washable solution for medical, laboratory, and industrial workstations. Yi Yi Enterprise.
- [Aluminum Name Plate Manufacturers | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-Printed-Aluminum-Plates.html): Yi Yi (SYN) makes custom aluminum nameplates with embossing, silkscreen printing and 3D shapes for industrial and commercial identification.
- [EL Panel Manufacturing | Yi Yi (SYN) | Flexible Lighting](https://www.yiyisyn.com.tw/en/category/CAT-EL-Panel.html): Yi Yi (SYN) manufactures custom EL panels with 0.13mm thickness, 0.1-0.2mA/cm² power consumption, and 9000-hour lifespan. Waterproof, flexible, ideal for.
- [In Mold Electronic Solutions | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/In-Mold-Electronic.html): Yi Yi (SYN) manufactures custom In Mold Electronic for electronic and industrial applications.
- [Custom LCD Displays | Yi Yi (SYN) - Display Solutions](https://www.yiyisyn.com.tw/en/product/Custom-LCD-Displays.html): Yi Yi (SYN) manufactures custom Custom LCD Displays for electronic and industrial applications.

## Membrane Switch
- [Waterproof Membrane Switches | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-Membrane-Switch.html): Source waterproof membrane switches with IP65, IP66 or IP68 options, PET membranes, metal domes, LEDs and custom adhesives from Yi Yi (SYN).
- [Flat Embossing Membrane Switch Keypad | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0101.html): IP65/IP66 waterproof dustproof membrane switch keypad with flat embossing buttons. Custom designed for industrial, beauty, fitness, and coffee machine applications. RoHS compliant.
- [Waterproof IP68 Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0102.html): Yi Yi (SYN) manufactures waterproof IP68 membrane switches with dust resistance, metal dome keys, and LED options. ISO 9001:2015 certified, RoHS compliant.
- [PET Circuit Membrane Switch | Yi Yi (SYN) - IP68 Waterproof](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0103.html): Professional PET circuit membrane switches with IP68 waterproof certification. Custom metal dome keypads for appliances, military, and industrial equipment. RoHS compliant.
- [Anti-Static Membrane Switch | Yi Yi (SYN) - IP66 Waterproof](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0104.html): Professional anti-static membrane switches with IP66 waterproof/dustproof certification. Custom aluminum frame design with metal dome assembly. RoHS compliant.
- [Isolation Ink Membrane Switch | Yi Yi (SYN) Keypad](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0105.html): Professional isolation ink membrane switches with silver ink circuits and metal embossing for industrial equipment. Customizable keypad solutions since 1974.
- [Red Transparent Windows Keypad | Yi Yi (SYN) Membrane Switches](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0106.html): Professional red transparent windows keypad with multi-layer design and flexible circuits. Customizable for microwave, logistics, and gaming applications. RoHS compliant.
- [Copper Circuit PI Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0107.html): Durable copper circuit PI membrane switches with metal domes for induction cookers, marine and industrial applications. RoHS compliant, waterproof certified.
- [Silk Screen Graphic Overlay Membrane Switches | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0108.html): Professional silk screen printed graphic overlay membrane switches with dual-layer circuits and round embossing dome design for air conditioning and food processing equipment.
- [LED Membrane Switch Assembly | Yi Yi (SYN) - Waterproof](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0109.html): Yi Yi (SYN) manufactures LED membrane switches with integrated backlight technology. IP68 waterproof, energy-efficient 3V DC operation, and custom LED assembly solutions for industrial equipment.
- [Medical Membrane Keypad IP68 | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0110.html): IP68 medical membrane keypad with LED backlight, flat embossing buttons, and 2.54mm connector. RoHS compliant, waterproof design for medical equipment control systems.
- [Flat Embossing Button Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0111.html): IP68 waterproof flat embossing button membrane switches with metal domes. Custom silkscreen printing, RoHS compliant. Ideal for medical and aerospace applications.
- [Aluminum Plate Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0112.html): Professional waterproof IP65 IP66 membrane switch with aluminum plate. Customizable metal dome keypad for food, fitness, medical equipment. RoHS certified.
- [Frame Embossing Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0113.html): Professional membrane switch with metal dome assembly, waterproof IP65, dustproof IP66. Custom CMYK color printing and LED options available.
- [Flat Embossing Keypad LED | Yi Yi (SYN) Membrane Switches](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0114.html): Professional flat embossing keypad with three-color LED, IP68 waterproof & IP66 dustproof. Customizable membrane switches for industrial applications by Yi Yi (SYN).
- [Equipment Membrane Switch Keypad | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0115.html): Custom waterproof, dustproof IP68 membrane switch keypads for appliances. LED indicators, flexible connectors, RoHS compliant. Taiwan manufacturer since 1974.
- [LED Membrane Switches | Yi Yi (SYN) - Medical & Industrial](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0116.html): Professional LED-integrated membrane switches with waterproof certification. Ideal for medical equipment, industrial control panels, and low-light applications. RoHS compliant.
- [Seven Segment Display Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0117.html): Professional IP68 waterproof seven segment display membrane switches with LED technology. RoHS compliant, durable for industrial applications.
- [Three Layer PET Membrane Switch with Metal Dome | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0118.html): Professional metal dome membrane switches with tactile feedback and IP68 waterproof design. Ideal for medical, industrial, and office equipment applications.
- [Metal Dome Membrane Switches | Yi Yi (SYN) - Adhesive Keypads](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0119.html): Professional metal dome membrane switches with self-adhesive backing. Customizable waterproof keypads for kitchen appliances, automotive, and food machinery. 52 years expertise.
- [Waterproof Membrane Switch | Yi Yi (SYN) | 3M Adhesive](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0120.html): Professional waterproof membrane switch with 3M adhesive circuit layer. Hospital-grade keyboard for medical, industrial, and emergency applications. RoHS certified.
- [FPC Membrane Waterproof Frame | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Membrane-Switch-0121.html): Professional FPC membrane waterproof frames with metal domes and LED indicators. Taiwan-made, 100% inspected. Ideal for metal detectors and industrial equipment.

## Graphic Overlay
- [Custom Graphic Overlays | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-Graphic-Overlay.html): Yi Yi (SYN) produces custom PET and PC graphic overlays with silkscreen printing, embossing, surface finishes and 3M or TESA adhesive options.
- [Mat Surface Graphic Overlay | Yi Yi (SYN) - Anti-Scratch](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-01.html): Professional mat surface graphic overlays with anti-scratch, UV and abrasion resistance. Custom silk screened overlays for LED, LCD, and touch screens by Yi Yi (SYN).
- [Graphic Overlay Embossing Solutions | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-02.html): Professional embossing graphic overlay manufacturing with Autotex and PET materials. Matte and gloss surface treatments for medical equipment and detectors.
- [Frame Embossing Buttons Graphic Overlay | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-03.html): Custom PET graphic overlays with embossing buttons for aerospace, transportation, and industrial applications. Professional membrane switch overlay solutions.
- [Anti-Scratch UV Resistant Overlay | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-04.html): Anti-scratch and UV resistant graphic overlay with silk screen printing. Custom PET overlay with 3M468 adhesive for industrial equipment applications.
- [Medical Graphic Overlay | Yi Yi (SYN) Silk Screen Printing](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-05.html): Yi Yi (SYN) manufactures medical machine graphic overlays with anti-scratch, UV and abrasion resistance. Custom silk screen printing, gradient color options, LED/LCD protection.
- [Multi-Color Graphic Overlay | Yi Yi (SYN) Membrane Switch](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-06.html): Professional graphic overlay manufacturing with silk screen printing, embossing, and gradient color options. 500K+ button durability for consumer electronics and industrial applications.
- [Custom Graphic Overlay Manufacturer | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Graphic-Overlay-07.html): Professional custom graphic overlay solutions with gradient, multicolor, and monochrome options. PC/PET materials with 3M adhesive and matte/gloss finishes.

## Flexible Printed Circuit
- [Flexible Printed Circuits | Yi Yi (SYN) FPC Manufacturer](https://www.yiyisyn.com.tw/en/category/CAT-Flexible-Printed-Circuit.html): Yi Yi (SYN) manufactures flexible printed circuits with single/double-sided, multilayer, and SMT capabilities. Temperature-resistant FPC for automotive.
- [Double-Sided FPC Manufacturer | Yi Yi (SYN) Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0201.html): Yi Yi (SYN) manufactures high-quality double-sided flexible printed circuits (FPC) with immersion gold plating, RoHS compliance, and custom assembly capabilities for industrial and consumer electronics.
- [Solderable Flexible Printed Circuit | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0202.html): Professional solderable FPC with metal pin connector, 3M adhesive backing, and RoHS compliance. Ideal for barcode scanners and measurement equipment.
- [Ultra-Thin FPC Manufacturing | Yi Yi (SYN) - Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0203.html): Yi Yi (SYN) manufactures precision flexible printed circuits with 0.1mm pitch and 0.08mm gap. RoHS compliant, immersion gold plated FPC for smartphones and wearables.
- [FPC with Molex Connector | Yi Yi (SYN) Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0204.html): Professional FPC with molex connector and metal dome assembly. Gold plated flexible circuits for medical devices, dashboards, and monitors. RoHS certified.
- [Multi-Layer FPC Solutions | Yi Yi (SYN) - Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0205.html): Yi Yi (SYN) manufactures multi-layer flexible printed circuits with gold plating and SMT services. ISO9001, RoHS certified. Perfect for wearables and medical devices.
- [Gold Plated FPC Flexible Circuits | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0206.html): Premium gold plated flexible printed circuits with connectors and tactile switches. Custom FPC solutions for telecommunications, PDAs, and transportation systems.
- [SMT Flexible Printed Circuit | Yi Yi (SYN) - FPC Manufacturer](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0207.html): Professional SMT flexible printed circuits with gold flash, stiffener, and 3M adhesive. Ideal for laptop, military, and industrial applications. Custom FPC solutions.
- [0.2mm Pure Copper FPC | Yi Yi (SYN) Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0208.html): Premium 0.2mm pure copper flexible printed circuits with immersion gold/tin plating. Ideal for communication supplies, barcode readers, and intercom systems.
- [Flexible Printed Circuit FPC | Yi Yi (SYN) - Gold Plated](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0209.html): Professional FPC manufacturer offering double-sided gold plated flexible circuits with SMT assembly and 100% testing. Custom solutions for camcorders and electronics.
- [Flexible Printed Circuit (FPC) | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0210.html): Professional FPC manufacturer offering single-sided, double-sided, and multilayer flexible printed circuits with SMT capability. Temperature-resistant up to 200°C.
- [FPC Light Guide Film | Double-Sided Flexible Circuits | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0211.html): Double-sided FPC with light guide film and side-light LED technology for even area illumination. Custom multilayer flexible circuits with SMT, 180-200°C tolerance, RoHS certified.
- [4 Layer Flexible Printed Circuit | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0212.html): Professional 4 layer flexible printed circuit manufacturer. Custom FPC with SMT, single/double sided, temperature tolerance 180-200°C. Taiwan-made quality.
- [Flexible Printed Circuit with Stiffener | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0213.html): Professional flexible printed circuit boards with stiffener for game consoles and scientific devices. Custom FPC manufacturing with 52 years expertise.
- [SMT Flexible Printed Circuit | Yi Yi (SYN) FPC](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0214.html): Custom SMT flexible printed circuits with single/double-sided, multilayer options. Temperature tolerance 180-200°C. Ideal for barcode readers, gaming, defense applications.
- [FPC Assembled Components | Yi Yi (SYN) Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0215.html): Expert FPC assembly with single, double, and multilayer options. Temperature tolerant to 200°C. Custom flexible circuits for printers, antennas, and packaging systems.
- [ESD Shielding Flexible Printed Circuits | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0216.html): Professional ESD shielding flexible printed circuits (FPC) with double-sided design and SMT service. Temperature tolerance up to 200°C for computers, military, and navigation equipment.
- [FPC with Metal Dome | Yi Yi (SYN) Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0217.html): Yi Yi (SYN) manufactures double-sided FPC with metal dome and SMT assembly. Custom flexible printed circuits with 180-200°C temperature tolerance.
- [DIP Components FPC | Flexible Circuits - Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0218.html): Professional flexible printed circuits with DIP components. Single, double-sided, multilayer FPC with SMT technology. Temperature tolerance 180-200°C. ISO certified.
- [SMT Flexible Printed Circuit | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0219.html): SMT flexible printed circuits with component assembly, LED, IC connectors. RoHS certified, waterproof, dustproof. Aerospace, mobile, logistics applications.
- [Flexible Printed Circuit Metal Dome | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0220.html): Double-sided FPC with metal dome assembly, gold plating, and SMT service. ISO9001 and RoHS certified for medical, computer, and consumer applications.
- [PET Type Flexible Printed Circuit | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0221.html): PET type flexible printed circuit boards with 3mil polyester base. Bendable, foldable FPC ideal for aesthetic medicine and scientific devices.
- [Automobile PET Copper FPC | Yi Yi (SYN) Flexible Circuits](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0222.html): Automobile-grade PET copper FPC with 3mil polyester base. Bendable flexible circuits for intercom, communication, and barcode reader applications.
- [Membrane Switch FPC Assembly | Yi Yi (SYN) - Tactile Switches](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0223.html): Professional membrane switch with flexible printed circuit featuring metal domes and LED integration. Ideal for coffee machines and beauty instruments with waterproof certification.
- [FPC Flexible Circuits & SMT Assembly | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0224.html): Professional flexible printed circuits (FPC) with SMT assembly. Single/double-sided, multilayer options. Temperature tolerance 180-200°C. RoHS compliant.
- [Flexible Printed Circuit Membrane Switch | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Flexible-Printed-Circuit-0225.html): Professional FPC manufacturing with single/double-sided, multilayer options and SMT technology. Temperature tolerance 180-200°C. Custom flexible circuits for medical, aerospace, and consumer electronics.

## Silicone Rubber Keypad
- [Silicone Rubber Keypads | Yi Yi (SYN) - Industrial Grade](https://www.yiyisyn.com.tw/en/category/CAT-Silicone-Rubber-Keypad.html): Yi Yi (SYN) manufactures custom Silicone Rubber Keypad for electronic and industrial applications.
- [Silicone Rubber Keypad PCB Assembly | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0301.html): Professional silicone rubber keypads with PCB assembly. Temperature-resistant (-55°C to +300°C), durable elastomer buttons for remote controls and handheld devices.
- [Silicone Rubber Keypad | Yi Yi (SYN) - Custom Tactile](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0302.html): Professional silicone rubber keypad manufacturer with 50+ years expertise. Custom tactile keypads for game consoles, intercom, and control devices. RoHS compliant.
- [PU Surface Treatment Silicone Rubber Keypad | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0303.html): Professional PU surface treatment silicone rubber keypads with laser etching and extended lifespan. Custom solutions for communication devices and appliances.
- [Single Button Silicone Rubber Keypad | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0304.html): Professional silicone rubber keypad manufacturer offering custom tactile response keypads with compression molding technology for gaming, appliances, and security systems.
- [Silicone Rubber Keypad | Yi Yi (SYN) - Tactile Switch](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0305.html): Professional silicone rubber keypad manufacturer. Custom compression molded tactile switches with adjustable feedback. RoHS certified, waterproof design for testing equipment and emergency buttons.
- [Mobile Silicone Rubber Keypad | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0306.html): Custom silicone rubber keypads with laser etching and LED backlight. Ideal for home appliances, measurement tools, and inflatable packaging systems.
- [Silicone Rubber Keypad | Yi Yi (SYN) - 1M Cycle Durability](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0307.html): Professional silicone rubber keypad manufacturer. Durable 1 million press cycles with metal dome or conductive carbon options. Medical & wireless equipment solutions.
- [Silicone Rubber Keypads | Yi Yi (SYN) | Tactile Switches](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0308.html): Custom multipurpose silicone rubber keypads with tactile response. Yi Yi (SYN) offers compression molded switches with up to 3mm travel and 500g force options.
- [Automobile Silicone Buttons | Yi Yi (SYN) Keypad Solutions](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0309.html): Professional automobile silicone buttons with tactile feedback. Custom-molded keypads up to 3mm travel. RoHS compliant. Contact Yi Yi (SYN) today.
- [Silicone Rubber Keypad | Yi Yi (SYN) | Tactile Switch](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0310.html): Professional silicone rubber keypad manufacturer. Custom elastomer keypads with tactile response, up to 3mm travel, 500g force. RoHS compliant, waterproof certified.
- [Silicone Rubber Keypads | Yi Yi (SYN) | Custom Molded](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0311.html): Custom translucent silicone rubber keypads with superior tactile response. Yi Yi (SYN) manufactures compression molded keypads for gaming, security, and telecommunications applications.
- [Multicolor Rubber Keypad | Yi Yi (SYN) - Custom Silicone](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0312.html): Custom multicolor silicone rubber keypads with adjustable tactile response. Compression molded for remotes, gaming, and industrial applications. RoHS compliant.
- [Silicone Rubber Keypads with PCB | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Silicone-Rubber-Keypad-0313.html): Custom silicone rubber keypads with PCB integration offering tactile response up to 500g force. Ideal for gaming, remotes, and industrial applications.

## Printed Circuit Board
- [Rigid PCB Manufacturing | Yi Yi (SYN) - Multi-Layer Boards](https://www.yiyisyn.com.tw/en/category/CAT-Printed-Circuit-Board.html): Yi Yi (SYN) manufactures high-quality rigid circuit boards up to 24 layers with immersion gold finish, metal dome switches, and customizable specifications.
- [Equipment PCB Solutions | Yi Yi (SYN) Rigid Flex Boards](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0501.html): Professional rigid flex PCB and multi-layer circuit board manufacturing with 52 years expertise. Custom equipment PCB solutions for appliances, agricultural systems, and copiers.
- [PCB Assembled FPC Solutions | Yi Yi (SYN) - 24 Layer](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0502.html): Professional PCB assembled FPC manufacturing up to 24 layers with SMT services. Custom circuit board assembly for medical, scientific, and refrigeration applications.
- [Industry PCB Manufacturing | Yi Yi (SYN) - Circuit Board Solutions](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0503.html): Yi Yi (SYN) manufactures industry-grade printed circuit boards using through-hole technology. Single and double-sided rigid PCBs for electronic equipment.
- [PCB with Silver Circuit | Yi Yi (SYN) - Circuit Board](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0504.html): Yi Yi (SYN) manufactures double-sided PCBs with silver printed circuits for robot vacuums and fire alarm systems. Automated assembly, mass production capabilities.
- [PCB Assembled Membrane Switch | Yi Yi (SYN) | Metal Dome](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0505.html): Professional PCB assembled membrane switches with metal dome tactile feedback. Custom rigid and flex PCB solutions for medical, transportation, and industrial applications.
- [Multilayer PCB Manufacturing | Yi Yi (SYN) - Custom Circuit Boards](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0506.html): Professional multilayer printed circuit board manufacturing with flying-probe testing. Custom Gerber file layout, rigid PCB, and double-sided PCB solutions for automotive, communication, and navigation applications.
- [Laser FPC & Multilayer PCB Assembly | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0507.html): Professional multilayer PCB and flexible circuit manufacturing with SMT/DIP assembly for industrial, medical, and military equipment. Custom FPC solutions since 1974.
- [Medical Device Multilayer PCB | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Printed-Circuit-Board-0508.html): Yi Yi (SYN) manufactures advanced multilayer PCBs for medical devices, beauty equipment, and automotive applications with 50+ years expertise.

## Waterproof Keyboard & mouse with antimicrobial coating
- [Waterproof Keyboard & Mouse | Yi Yi (SYN) - IP 65 Rated](https://www.yiyisyn.com.tw/en/category/CAT-Keyborad-Mouse.html): IP 65 waterproof keyboard with antimicrobial coating. Heavy-duty, washable solution for medical, laboratory, and industrial workstations. Yi Yi Enterprise.
- [Waterproof Keyboard & Mouse | Yi Yi (SYN) - IP68 Antimicrobial](https://www.yiyisyn.com.tw/en/product/Keyborad-Mouse-01.html): Yi Yi (SYN) manufactures IP68 waterproof keyboards and mice with antimicrobial coating. Ideal for medical carts, labs, and industrial workstations. RoHS compliant.

## Aluminum Nameplates
- [Aluminum Name Plate Manufacturers | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-Printed-Aluminum-Plates.html): Yi Yi (SYN) makes custom aluminum nameplates with embossing, silkscreen printing and 3D shapes for industrial and commercial identification.
- [Printed Aluminum Nameplates | Yi Yi (SYN) Custom Metal Labels](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Platess-0601.html): Custom printed aluminum nameplates and pressure scale plates. Waterproof metal labels with polyurethane coating. RoHS compliant. Contact Yi Yi (SYN) today.
- [Anodized Aluminum Nameplate | Yi Yi (SYN) Metal Plates](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0602.html): Custom anodized aluminum nameplates with color logo printing and embossing. Ideal for temperature controllers, fuel meters, and industrial equipment housing identification.
- [Custom Aluminum Nameplate | Yi Yi (SYN) - Metal Plate](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0603.html): Professional custom aluminum nameplate printing for industrial equipment. Company name, model number, and manufacturing date printing. RoHS compliant.
- [Temperature Scale Nameplate | Yi Yi (SYN) Aluminum Plates](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0604.html): Professional silk screen printed aluminum nameplates for automotive dashboards, temperature gauges, and industrial instruments. Custom metal plates with precision printing.
- [Fuel Level Scale Nameplate | Yi Yi (SYN) Aluminum](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0605.html): Professional printed aluminum nameplates for fuel scales, pressure gauges, and dials. Custom metal nameplate manufacturing with precision printing since 1974.
- [Aluminum Nameplates & Printed Metal Plates | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0606.html): Professional printed aluminum nameplates and die-cut metal plates for fitness equipment, home appliances, and industrial applications. Custom nameplate solutions by Yi Yi (SYN).
- [Embossed Aluminum Nameplate | Yi Yi (SYN) Custom Metal Labels](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0607.html): Custom embossed aluminum nameplates with three-color printing. Perfect for kitchenware, agricultural systems, and pressure gauges. Manufacturer since 1974.
- [Electroplating Aluminum Plates | Yi Yi (SYN) Nameplates](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0608.html): Professional electroplating aluminum plates and anodized nameplates for medical, bicycle, and fitness equipment. Custom metal labels with gradient printing.
- [Aluminum Nameplates | Yi Yi (SYN) Metal Label Solutions](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0609.html): Professional aluminum nameplate manufacturing with multi-color silk screen printing. Custom metal labels for automotive, measurement devices, and industrial applications.
- [Anodized Aluminum Nameplates | Yi Yi (SYN) - Custom Metal Plates](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0610.html): Professional anodized aluminum nameplates with custom printing and adhesive options. Ideal for automotive, consumer electronics, and precision instruments.
- [Equipment Identification Nameplate | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Printed-Aluminum-Plates-0611.html): Professional aluminum and metal nameplates for equipment identification. Custom anodized plates from .002" to .125" thick for industrial applications.

## EL Panel
- [EL Panel Manufacturing | Yi Yi (SYN) | Flexible Lighting](https://www.yiyisyn.com.tw/en/category/CAT-EL-Panel.html): Yi Yi (SYN) manufactures custom EL panels with 0.13mm thickness, 0.1-0.2mA/cm² power consumption, and 9000-hour lifespan. Waterproof, flexible, ideal for.
- [Automobile EL Panel | Yi Yi (SYN) - Electroluminescent](https://www.yiyisyn.com.tw/en/product/El-Panel-01.html): Professional EL panel manufacturer. Uniform, stable lighting in blue, green, white colors. Ultra-thin design under 0.6mm for automotive and handheld devices.
- [Multicolor EL Panel Backlight | Yi Yi (SYN) Manufacturer](https://www.yiyisyn.com.tw/en/product/El-Panel-02.html): Professional multicolor EL panel backlight manufacturer with 50+ years expertise. Low-power cold light technology for automotive and emergency lighting applications.
- [Dashboard Backlight EL Panel | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/El-Panel-03.html): Ultra-thin EL panels under 0.6mm for dashboard backlighting and LCD modules. Custom shapes available. Low-power, long-lasting electroluminescence technology.
- [EL Panel Membrane Switches | Yi Yi (SYN) Backlit Keypads](https://www.yiyisyn.com.tw/en/product/El-Panel-04.html): Professional EL panel assembled membrane switches with waterproof, dustproof certification. Customizable backlit keyboards for medical and industrial applications.
- [Fuel Meter EL Panel | Yi Yi (SYN) | Electroluminescence](https://www.yiyisyn.com.tw/en/product/El-Panel-05.html): Professional EL panel manufacturer offering ultra-thin fuel meter solutions with stable, uniform backlighting. Customizable designs for automotive and industrial applications.
- [EL Panel Membrane Switch Backlight | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/El-Panel-06.html): Custom EL panel assembled membrane switches with uniform, stable backlighting. Ideal for darkroom equipment. RoHS compliant. Contact Yi Yi (SYN) today.
- [EL Panel Backlight Solutions | Yi Yi (SYN) Lectern](https://www.yiyisyn.com.tw/en/product/El-Panel-07.html): Flexible EL panels for digital lecterns and aircraft dashboards. Low power consumption (0.1-0.2mA/cm²), bendable design, DC5V-12V. Custom solutions available.
- [EL Panel Membrane Switch | IP68 Waterproof | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/El-Panel-08.html): IP68 waterproof EL panel with membrane switch assembly. ESD-shielded design for industrial and medical equipment. Customizable tactile or flat buttons.
- [Billboard EL Panel Keyboard | Yi Yi (SYN) - Customized Solutions](https://www.yiyisyn.com.tw/en/product/El-Panel-09.html): Billboard EL panel keyboards with flexible design, 1M+ durability, and DC5V-12V input. Custom electroluminescent keypads for medical, industrial, and military equipment.
- [Automobile EL Panel | Yi Yi (SYN) | Bendable Electroluminescence](https://www.yiyisyn.com.tw/en/product/El-Panel-10.html): Professional automobile EL panels with uniform light, bendable design for curved surfaces, and low power consumption. Ideal for water and fuel meters.

## In Mold Electronic
- [In Mold Electronic Solutions | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/category/CAT-In-Mold-Electronic.html): Yi Yi (SYN) manufactures custom In Mold Electronic for electronic and industrial applications.
- [In Mold Electronic Manufacturing | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/In-Mold-Electronic.html): Yi Yi (SYN) specializes in In Mold Electronic technology combining electronics and molding for integrated products with reduced assembly and environmental benefits.

## Custom LCD Displays
- [Custom LCD Displays | Yi Yi (SYN) - Display Solutions](https://www.yiyisyn.com.tw/en/category/CAT-Custom-LCD-Displays.html): Yi Yi (SYN) manufactures custom Custom LCD Displays for electronic and industrial applications.
- [Custom LCD Displays & Touchscreen Solutions | Yi Yi (SYN)](https://www.yiyisyn.com.tw/en/product/Custom-LCD-Displays.html): Yi Yi (SYN) provides custom LCD displays, touchscreen solutions, and display integration services with EMI shielding, antimicrobial coatings, and heater options for medical, aviation, and industrial applications.
## Serivce
- [Fast Prototype | Top-Quality Waterproof Keypads Manufacturer - YiYi Enterprise Co., Ltd](https://www.yiyisyn.com.tw/en/page/Fast-Prototype.html):  YI YI is high-quality Fast Prototype,  manufacturer from Taiwan since 1974. With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.

## News
- [YI YI high-quality Membrane Switch, Membrane Switch Keypad, Graphic Overlay, Printed-Aluminum-Plates, FPC, Flexible Printed Circuit, Silicone Rubber Keypad, Rubber Keypad, PCB, EL Panel, Printed Circuit Board manufacturer from Taiwan | Yi Yi Enterprise Co., Ltd.](https://www.yiyisyn.com.tw/en/news/index.html): YI YI is a Taiwan high-quality Membrane Switch, Membrane Switch Keypad, Graphic Overlay, Printed-Aluminum-Plates, FPC, Flexible Printed Circuit, Silicone Rubber Keypad, Rubber Keypad, PCB, EL Panel, Printed Circuit Board manufacturer since 1974.  With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.
- [Our membrane switches have passed waterproof and dustproof certification tests | Innovative Membrane Switches Manufacturer - YiYi Enterprise Co., Ltd](https://www.yiyisyn.com.tw/en/news/YI-YI-news-001.html): YI YI is a Taiwan high-quality Membrane Switch, Membrane Switch Keypad, Graphic Overlay, Printed-Aluminum-Plates, FPC, Flexible Printed Circuit, Silicone Rubber Keypad, Rubber Keypad, PCB, EL Panel, Printed Circuit Board manufacturer since 1974.  With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.
- [2021 Covid 19 | Innovative Membrane Switches Manufacturer - YiYi Enterprise Co., Ltd](https://www.yiyisyn.com.tw/en/news/YI-YI-2021-Covid+19.html): YI YI is a Taiwan high-quality Membrane Switch, Membrane Switch Keypad, Graphic Overlay, Printed-Aluminum-Plates, FPC, Flexible Printed Circuit, Silicone Rubber Keypad, Rubber Keypad, PCB, EL Panel, Printed Circuit Board manufacturer since 1974.  With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.


## Contact
- [Contact | Top-Quality Waterproof Keypads Manufacturer - YiYi Enterprise Co., Ltd](https://www.yiyisyn.com.tw/en/page/contact-info.html): YI YI Enterprise Co Ltd was established in 1974. We have primary competitive advantages, such as experienced R&D departments, OEM / ODM capability, and large production line. To satisfy customers' requirement is our permanent mission.

We are expert in manufacture of membrane keyboard switches, flexible printed circuits, rigid-flex board, el panels, silicone rubber keypad and name plates. We have acquired the skills and technology necessary to produce top-quality products that are suitable for use in computers, instruments and other electronic and electrical goods.

We have two factories located in Taiwan. With a total of 5 million US dollars in capital investments, we have six production lines, using imported and locally sourced equipment.

We accept OEM and ODM requirement from customers. All our materials and components are RoHS compliant. We do inspect at each stage of production and every finished product is checked before delivery as part of our 100% quality testing. YI YI is high-quality Contact,  manufacturer from Taiwan since 1974. With 50 years experience for producing Membrane Switch and FPC. 80% exportation to US, Europe, Australia, New Zealand, and Russia. The main products are membrane keyboard switches, flexible printed circuits, rigid-flex boards, EL panels, and silicon rubber keypads and name plates.

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