GE Security Interlogix NX650 Wireless Door Window Sensor
Use door/window sensors to protect anything that opens and closes, such as doors, windows, jewelry cases, and gun cabinets. The sensor detects intrusion with a magnet and reed-switch mechanism that signals an alarm during unauthorized entry. Features: Installs on anything that opens or closes. 2 internal reed switches allow for vertical or horizontal mounting. Flat surface mounting. Tamper switch