Check the listing for details. Liftmaster 841LM Automatic Garage Door Deadbolt Lock. Condition: New. Listed at 109.95 USD. Liftmaster 841LM Automatic Garage Door Deadbolt Lock Liftmaster 841LM Automatic Garage Door Deadbolt LockDescriptionThe Automatic Garage Door Lock is a powerful add-on accessory that works automatically with the opener. When two locks are installed, the two-point locking system has been engineered, tested and approved to meet hurricane-ready requirements1 by reinforcing the garage door automatically.Features:Automatic Operation: Performs in tandem with the opener, so it always locks and unlocks.Anywhere Assurance: Powered by myQ technology, homeowners will have the ability to open and close their garage door from anywhere2 and will receive alerts if its left open.Safety and Security:Absolute Protection: A deadbolt lock reinforces the garage door automatically when the garage door is closed.Audible Security: The sound of the lock engaging provides homeowners with the assurance the garage door has been secured. Compatibility:The Automatic Garage Door Lock 841LM is available and sold separately for LiftMaster Garage Door Opener models: WLED, 8550WLB, 8360WLB, 8580WLB, and 8587W The Automatic Lock is included in 8500W. Disclaimer:1If the homeowners garage door requires a center post to be installed during a wind event, the LiftMaster Automatic Garage Door Lock cannot be used to replace that system. It is recommended that the homeowner please contact their local LiftMaster installer or garage door manufacturer.2Cellular data or Wi-Fi connection required. Test equipment regularly and follow safety instructions. Payments & Returns Policy