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LiftMaster 829LM Garage Door Monitor

4.6 out of 5 stars 227 customer reviews
| 38 answered questions

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Ships from and sold by Open Door Discount Remotes.
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  • Only Works with MyQ Technology openers. Does not work with all openers
  • Lets you know when your door is open or closed. Close the door from inside your home.
  • Volume controlled alert lets you know when the door is being opened.

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Frequently Bought Together

  • LiftMaster 829LM Garage Door Monitor
  • +
  • Liftmaster 888LM Security+ 2.0 MyQ Wall Control Upgrades Previous Models 1998 (and later)
  • +
  • LiftMaster MyQ Retrofit Package
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Product Description

Check and close your garage door from any room in the house. Green and Red LED lights indicate wether the garage door is open or closed. Volume controlled alert lets you know when the door is being opened. MyQ enabled technology allows you to monitor and close up to four garage doors.

Product Information

Technical Details

Part Number 829LM
Item Weight 8 ounces
Product Dimensions 4.9 x 4 x 1.5 inches
Item model number 829LM
Color Black
Item Package Quantity 1
Batteries Included? No
Batteries Required? No

Additional Information

ASIN B005FT4MY6
Customer Reviews
4.6 out of 5 stars 227 customer reviews

4.6 out of 5 stars
Best Sellers Rank #69,599 in Home Improvements (See top 100)
#23 in Home Improvement > Building Supplies > Building Materials > Doors > Garage Doors, Openers & Parts > Hardware > Sensors
#16,073 in Home Improvement > Hardware
Shipping Weight 8 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available August 3, 2011

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

I purchased this item to work with Chamberlain WD962KEV Whisper Drive Garage Door Opener with MyQ Technology and Battery Backup. As that opener is MyQ and Security+ 2.0, this accessory works just fine. In contrast with the older generation of this accessory, this one communicates with the opener itself, and does not require a sensor unit to be mounted on the garage door frame. If you have the kind with the door sensors, these will not inter-operate. My opener claims that it can work with up to 8 MyQ accessories, so my assumption is that you can have more than one of these working (based on the capabilities of your opener). I only have one of these monitors, so I cannot say that for sure.

There are two lights that indicate the state of all of the garage door openers. If at least one is open, the red light blinks. If all are closed the green light is solid. Nice and simple. There is a button to close all the doors. My opener beeps and flashes the light just before the close happens when the button is pressed, so there is a chance to get out of the way and break the safety beam/press the button to stop the close process. There are also audible alerts, which can be set to off, low, medium, or high volumes. Three short beeps indicate a door is opening. A short beep that repeats every 30 seconds or so indicate one or more doors are open. Note that this accessory has a wall wart that is not pictured, so it must be placed close to an outlet. The wall wart plug sticks out of the rear of the unit. This works with up to 4 door openers, I am using it to monitor two. The thing does exactly what it says it will do.
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I purchased two of these monitors. In my particular case, the garage door is not visible from the two units in the building. As the manager of the building, I wanted tenants to have a way of knowing the door is closed. Programming the device takes less than a minute. Press the learn button located on the garage door opener that lifts/closes the door. Then press a button on the monitor and it is ready to work. You can unplug the unit and put in almost anywhere in your apartment. When the door is open the unit displays a red light and it beeps periodically. You can defeat or change the volume of the beep. Press the large close button on the monitor and the garage door will close and then display a green (door closed ) light. Before the door closes, the lights on the opener in the garage will flash and the unit will beep several times before the door begins to close. This alerts a person that may be in the garage that door is about to close. I was happy to find out that the unit has a considerable range. One unit is located on the second floor about two hundred feet from the garage and it works. When someone opens the door, the unit does beep to alert a person someone is entering the garage. Yes, there are other more sophisticated devices that allow a person to use a smart phone but this was a simply inexpensive solution. I am happy.
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By Edward on February 15, 2013
Verified Purchase
The product connected easily to my Sears Homelink system (Liftmaster makes all of Sears' Craftsman brand openers) and works well. Has an audible beep with an adjustable volume level and a bright LED light that changes colors to let you know if the door is open or closed. I have it on my nightstand next to the bed and love just being to glance over and know the garage is all closed up. Also has a close button on it so even if you forgot to close it, you can close it from there.
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This device is designed to plug in to an AC power outlet inside your home and let you know with simple red or green lights if your garage door is open or closed. If the door is open the red light will flash brightly. If the door is closed the green light will glow. If the door is open you can close it using a button on the monitor.

Here are the key things you need to know:

1. Although sold by Liftmaster this monitor will work with any garage door opener that has the MyQ feature installed, regardless of brand. Liftmaster openers are sold under the Chamberlain and Sears Craftsman brand names, among others. MyQ is a feature that connects to your home WiFi system and permits you to operate enabled products (garage door and gate openers) using an app on a smartphone. It is built in to many of the newer openers and can be added to any “MyQ-enabled” opener. Note that MyQ does require you to have WiFi and also have a smartphone.

2. This is not exactly the same as the remote opener on your garage wall or outside wall in that it will NOT open the door, the push button will only close the door from wherever you have the monitor plugged in.

3. There is no real installation, just plug it in, push a small button on the back and within 60 seconds press the “learn” button on your garage door opener. They instantly pair and recognize each other.

4. Some of the user questions and answers are a little misleading … there are actually two different “alert tones” involved. One is a beeper inside the monitor that can be set to warn you if the garage door is being opened. This is a great security feature or just a nice convenience to give you a heads-up that someone is home.
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