Universal Garage Door Monitor #915LM

Lets  you know whether  your garage door is open or closed. Signals from inside any room you choose. Works with all garage doors; with or without a garage door opener.  The small monitor conveniently plugs into any regular socket.  The light flashes red when the door is open; green when the door is closed. Gives you peace of mind knowing your garage door is closed. It's fast, easy installation with no tools required, and makes a great gift!