GE Wireless Door / Window Contact Sensor - Use with Simon, or Concord systems. 
Use door/window sensors to watch over anything you have that opens and closes, such as doors, windows, jewelry cases, and gun cabinets. The sensor automatically senses intrusion with a magnet and reed-switch mechanism that tranmits a signal to an alarm in the event of an unauthorized entry.
Features:
- Works on any item that opens or closes
- Intended for low and average traffic areas
- Includes a magnet
- Color: White
- Dimensions: 1.13" wide, 4.25" high, .88" deep
- Batteries: 2 AAA alkaline
- Battery life: 4-6 years
- Compatibility: Simon and Concord 4
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