Metal shrapnel (Dome Array) as the key contact surface on the circuit. Key life of more than a million times, feel good, uniform intensity, high-temperature environment can be used. This product is mainly used for industrial control equipment function keyboard. Haven This product can be designed according to customer needs key content, color, effects, panel with Ketu Tai PET F150 frosted screen printing, window window was treated with UV transparent, attractive appearance. Silver circuit as Acheson Acheson ED-820B printed circuit, resistance, long life. Back with 3M467 tape.