LAMPS & ADAPTORSCRIMPS, SLEEVE & SHRINKTRANSFORMER & DRIVERSTOOLSFIXINGSCONSUMABLESELECTRICALSSPECIALIST REPAIRPOINT OF SALECLEARANCE / REUSE
This switch is designed to be fixed to the side of a door frame. When the door is opened, the switch is released to switch on the light / sound a buzzer / whatever you want it to switch. When the door is closed, the switch is pressed back in, breaking the circuit.
Width - 30mm, Height - 24mm