Key Specifications/Special Features: Membrane keybord with metal dome Combine the membrane with the aluminum panel Contact point can be metal dome, poly dome and flat Metal dome, LED and other components can be pasted on the aluminum panel Electrical features: Return circuit resistance: generally 1Ω (can be different when necessary) Contact resistance: bellow 2Ω Circuit rating: bellow 35V DC, 100mA, 750mV Dielectric withstand voltage: 250VRms (50 to 60Hz 1min) Insulation