Tells You If Your garage Door Is Open Or Closed. Security For The Largest Door To Your Home. 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.
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