... industry automation system.Statement:1) The material of our membrane keyboard switches: the graphic overlay mostly use PC (polycarbonate) or ... installed or not. Also can provide the membrane switches with special requirements, such as Shielding, Windows/Lens Coating, Embossing, Embedded ... feel free to contact me!Electrical Performance of our membrane keyboard switches:1) Operating Voltage: 0~35 V DC.2) ...