Connect your garage door sensor … The Roost Smart Garage Door Sensor is a Wi-Fi connected device that sends a notification to your smartphone communicating the state of your garage door; open or closed. Simply place the sensor on the top panel of your garage door to be informed when the garage is even partially open. Up to 3 Openers. This Chamberlain garage door sensor notifies you if it is open or closed no matter which corner of the house you are in. Easily … As of January 1, 1993, it became mandatory that all garage door openers have safety eye sensors built into them. Confidently know that every click sends a secure code to your garage door opener. Sometimes, my door likes to do things like open immediately after closing, or the remote button is accidentally pushed, and I have no idea my garage is open … The Skylink GS-MT Wireless Garage Door Sensor 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. Controls up to three garage door openers, gate operators, or myQ®-enabled light accessories. Garage Door Open Position Indicator Light: I can't see my overhead door from my house. When you leave your garage door open, the sensor automatically sends a signal to the monitor, and a garage door alarm flashes a red light indicating that the door is open. These sensors are designed to protect children from unnecessary harm and are usually positioned about 6 to 8 inches in front of the vertical tracks that the garage door … The mechanism of the device is quite simple.