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LiftMaster 821LMC-S Smart Garage Control
This device provides a quick and easy smart home upgrade that allows you to link your existing garage door opener to the myQ app.
Hub Dimensions W 3-7/8" x H 3-7/8" x D 1-1/4"
Door Sensor Dimensions W 2-5/8" x H 2-5/8" x D 7/8"