Get peace of mind and added convenience 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.

• Monitor and close up to four garage doors or gate operators from any room in the house
• Green and red LEDs indicate whether the garage door or gate is open or closed
• Volume-controlled audible alert lets you know when the garage door or gate 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