Use window sensors to protect any window that opens and closes, such as single or double hung windows, sliding windows. 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 For low and average traffic areas. Color: White Dimensions: 1.13" wide, 4.25" high, .88" deep Batteries: 2 AAA alkaline
