LiftMaster 841LM Automatic Garage Door Lock vs LiftMaster 041A6102 Power Door Lock Kit

These are not competing products. The 841LM is an add-on automatic deadbolt for specific LiftMaster openers; the 041A6102 is a replacement power lock for LiftMaster and Chamberlain wall-mount jackshaft openers. Buy the 841LM only if your opener is on its short compatibility list and you want app monitoring through myQ. Buy the 041A6102 only to replace a failed lock on a 3800, 8500 or RJO-series opener. Owners of the 841LM report failures around a year, often from plastic internal gears, so the 041A6102 is the safer buy when it fits.

• Choose the LiftMaster 841LM if your opener is a listed auto-lock-capable model and you want a deadbolt that locks itself and reports through the myQ app.
• Choose the LiftMaster 041A6102 if your wall-mount jackshaft opener's power lock has failed and you need the correct replacement part.