Garage access · Exact-model record
LiftMaster Smart Garage Control
821LMC-SLast source check: July 25, 2026 · US market
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01
Source-backed record
What is verified for this exact model.
Construction
Wi-Fi hub plus wireless tilt sensor for one sectional garage door
manufacturer publishedChecked July 25, 2026 ↗Compatible accessories
A second compatible door sensor can be added for two-door control; exact opener compatibility must be checked
manufacturer publishedChecked July 25, 2026 ↗Power
Indoor AC-powered hub using 2.4 GHz Wi-Fi
manufacturer publishedChecked July 25, 2026 ↗02
Evidence limits
Conflicts and caveats we will not hide.
Compatibility is exact-opener work
The hub is not universal. Opener brand, model, generation, learn-button color, sectional-door fit and any required adapter or extra sensor must be checked first.
Clean exact manufacturer image and offer
The local asset is LiftMaster's exact 821LMC-S hub-and-sensor packshot. Amazon exact ASIN B09RQ8BGRM exposed a current buy box on release day.