Features: 1.Material: Silicon, or with conductive rubber or metal dome 2.Operation temperature: -30 ~ 80C; 3.Storage temperature: - 40 ~ 100C; 4.Contact resistance: Q 100; 5.Stroke Voltage:25-30KV/mm 6.Expectation of Life: 500,000 - 20,000,000 closures; 7.Meet ROHS directive,the standard of ISO 9001 8.Different keypad refer to the detailed technical parameter. Fields of application: Keypads of Telephone, Interphone, Alarm System , machice equipment ,Remote Control, Computer, Toy;