Insteon 2843-292 Door/Window Wireless Open/Close Sensor is a magnetic contact sensor that wirelessly controls lights and appliances throughout your house. Open/Close Sensor can do things like turn on lights, set the thermostat, or trigger a custom event in HouseLinc. When the back door sneaks ajar or the side window slides open, You will be alerted. Useful for doors, windows, drawers, sheds, cabinets, and anything else that opens, Open/Close Sensor is a wireless, easy-to-use solution for adding convenience and awareness to any home.