Using Z-Wave technology, the HomeSeer Wireless Z-Wave Plus Door Window Sensor - Gen5 (U.S) allows you to monitor when your door or window is opened or closed. It consists of a sensor body and a magnet piece. The magnet piece mounts on the actual door/window while the sensor body mounts on the door/window frame. Whenever the sensor and magnet are separated or joined together (upon opening or closing the door or window), a Z-Wave alert is triggered. This sensor is used with a Z-Wave compatible hub/controller for use in automated events or scenes, and it conveniently runs on AAA batteries (included). CONTENTS: Sensor Body, Magnet, Double-Stick Tape, Screws, (2) AAA Batteries, Manual. SPECS: MPN: HS-DS100. Z-Wave frequency: 908 Mhz (US). Range: Up to 300 feet line of sight. Operating temperature: 32 to 104 degrees F (0 to 40 degrees C). Certifications: Z-Wave Plus. Warranty: 1 year limited. Dimensions: Sensor Body: 3 x 1.1 x 0.75 inches. Magnet: 3 x 0.5 x 0.75 inches.