The Skylink GS-MT Wireless Garage Door Sensor will track the garage door opened or closed status and send a push notification to your smartphone with any change in status. Simply place the sensor on the top panel of your garage door to be informed when the garage is even partially open. The Garage Door Sensor is operated by a single AAA Alkaline Battery (Sold Separately). Compatible with SkylinkNet Connected Home Security Alarm & Home Automation Systems and M-Series Remotely monitor the status of your Garage Door Monitors Garage Door open/close; Tilt sensor; DOES NOT WORK BY ITSELF a Skylinknet kit (SK-150, SK-200, SK250 -sold separately) or an Indoor Siren (M-1 -sold separately) is required to work Wireless range up to 600 feet in open area (Sensor to Hub) Compatible with SkylinkNet and M-Series System. SkylinkNet Alarms GS-MT Garage Door Motion Sensor for SkylinkNet Alarms