- Monitor and close up to four garage doors from any room in the house
- Green and red LEDs indicate whether the garage door is open or closed
- Volume-controlled audible alert lets you know when the garage door is being opened
- Fast, easy installation; no tools needed
- Signals to any room in the home
- Compatible only with LiftMaster Security+2.0™ garage door openers
829LM Garage Door Monitor
Get the peace of mind of knowing for certain that your garage door is closed. The LiftMaster® 829LM Garage Door Monitor tells you if your garage door is open or closed from any room in your home.