Check the listing for details. Magnetic Sensor Window Door Contact NC Alarm Intrusion Detection. Condition: New. Listed at 16.21 USD. Built-in magnetic sensor with normally closed NC contact with two elements (cylindrical magnet and cylindrical sensor). When the magnet is close to the sensor, the contact remains closed and if instead the magnet is removed from the sensor the circuit opens by reporting to anti -theft alarm control units or electronic management control units the opening of the door/window. The two elements are protected from humidity. Thanks to the cylindrical shape, the two elements can be recessed invisibly inside the door, leaf or window. SPECIFICATIONS Color BLACK/BROWN Dimensions approx. Diameter 9.2 x 22 mm All our products are guaranteed both to delivery and in the time of use. For defective products, we carry out free replacement of the product. The warranty has a duration of 2 years for private i.