... ,ROHS, 3-customized design welcomed 4-material:PC,PET,3M membrane switchSpecification:1.Best quality2.Best price3.Best service advantages: 1 ... , acid and alkali proof, quakeproof. 5. Low cost, high lifespan, membrane switchs design and manufacture are using the keyboard as a ... costs are lowest,the life expectancy of different types of membrane switch is more than 100 million times. 6. Easy to ...