Liftmaster 915lm Wireless Garage Door Monitor

Tells you if your garage door is open or closed. Great convenience and peace-of-mind. Works with any garage door. Monitors up to 4 garage doors (with additional sensors - 916LM) When light flashes red door is open Fast easy installation; no tools needed Signals to any room in the home Monitor the status of your garage door from inside your home Need an Extra Sensor Get the Liftmaster 916LM.