Cable Length: 25cm/9.8"; Total Size: 25mm x 23.5mm/0.98" x 0.93" (L*D)
This Recessed Door Contact Sensor works with any access control or burglar alarm system available
N.C. means Normally Closed: When the magnet together, the circuit is conductive( light on ); when the magnet separates, the circuit is not conductive ( light off ).
The Magnetic Door Switch must be installed according to the sensing distance. It can only provide a switch signal to the transmitter. It cannot directly load the power, nor directly connect the lamp!