The LiftMaster 841LM Automatic Garage Door Lock is a UL-tested deadbolt system designed for sectional garage doors with torsion spring assemblies. This automatic lock engages and disengages with each garage door cycle, providing secure protection against forced entry and extreme weather conditions.

• Model: 841LM
• Automatic deadbolt lock for sectional garage doors
• Locks and unlocks in sync with the opener
• Audible click confirms lock engagement
• Remote monitoring and control via MyQ® App
• Enhanced resistance to tampering and high winds
• UL-tested for safety and long-term reliability
• Manual release option for emergencies
• One-year limited warranty

Compatibility

The LiftMaster 841LM is compatible with select garage door openers equipped with Security+ 2.0 and MyQ® technology, including:

• LiftMaster 8550WL
• LiftMaster 8587W
• LiftMaster 8360W

Note: For use on sectional doors with torsion spring systems only.

Included in the box

• LiftMaster 841LM Automatic Garage Door Lock
• (2) Mounting screws (1/4"-20 x 1/2")
• 33' wire
• Installation template