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A Doorbell Switch is a basic, on/off switch that controls a single light or lighting circuit. Flame Retardant, UV Light Stabilized, Unbreakable Poly Carbonate (PC). Glossy Finish. Silver cadmium oxide (AgCdo) contacts provide high conductivity and anti-weld properties. Salt spray tested anti-corrosive steel springs and screws to provide consistent contact pressure. Metal parts are made of high conductive Copper alloys. Radium Indicator. User Convenient.