SKU: LM-821LMC-SENSOR
The LiftMaster 821LMC-SENSOR is an additional door sensor designed for use with Smart Garage Control, myQ Smart Garage Hub, and myQ Garage. This sensor allows users to add control of a second garage door opener to their existing Smart Garage setup. It offers the capability to secure, control, and monitor a second garage door through the myQ app, enhancing the overall security and convenience of the garage system.
Programming Instructions:
LiftMaster Smart Garage Control Owner's Manual
myQ Smart Garage Control Door Sensor Quick Start Guide


We've found that replacing the majority of the hinges and installing the rest of the kit does a pretty good job of silencing the door without needing to deal with that bottom roller. If you really feel it needs to be changed, we have a separate process for that, but it's not necessary for most installations.
