Specialize in manufactuing membrane switch:
Overlay+circuit+LED+metal dome or poly dome array+connector+double side tape
EL backlight+Rubber keys 
Aluminum plate+Rubber keys
Metal domes
Flat without Tactile Effect
Embossing with Tactile Effect
Embossing with Metal Dome
Membrane Switch with FPC

Performance indicators: 
1. Electronic characteristics 
Circuit rating: 35V (DC), 100mA, 1W
Contact resistance: 10Ω--500Ω (According the trace length and materials to comfirm) 
Insulation resistance:> 100MΩ 250V DC 
Contact bounce: ≤ 5ms     Dielectric withstand:250VRms (50-60Hz 1min) 
Life expectancy: flat type ≥ 500 million times, tactile type: ≥ 100 million times 
2. Mechanical Properties  Actuation force:flat type 57-284g (2-10 Oz), tactile type 170-397g (6-14 Oz)  Switch stroke: flat type 0.1-0.5mm, tactile type 0.6-1.5mm 
3. Environmental parameters 
Operating Temperature: -40 C- +80 C, Storage temperature: -40 C - +85 C
Humidity: 40C , 90% -95%, 240 hours