... (φ18mm), square (18x18mm), rectangle (18x24mm) three specifications, including signal light,button,button with pilot light,rotary button, key button,emergency stop button, buzzer ... -1Rated operational voltage Ue(V)380V 250V 240V 125VLamp typeLED light-emitting diodesLamp beads life≥5000HLight colorWhite green red yellow blueVoltage ...