The SONOFF AirGuard TH is a smart temperature and humidity sensor with a large 3.6″ high-definition LCD screen that makes environmental data immediately readable from across the room. At a glance, the display shows the current temperature and humidity, the daily high and low for both readings, and optionally the live data from a second remote sensor located elsewhere in your home — all on one screen without needing to open an app.
The AirGuard TH connects in two ways depending on your setup. Via Zigbee, it pairs with a compatible gateway to enable full remote access, historical data, smart home automations, and notifications from anywhere. Via Bluetooth, it connects directly to your phone for local real-time monitoring, historical statistics, and dew point data — no gateway required for basic use. Dew point data is particularly useful for identifying condensation risk in bedrooms, bathrooms, and rental properties where mould prevention is a priority.
A standout feature is Remote Temp. & Humi. Display: pair the AirGuard TH with a second SONOFF Zigbee sensor placed in a different room (such as a child’s bedroom or a basement), and both readings appear simultaneously on the AirGuard TH’s screen. This turns the device into a two-zone display station, giving you a complete picture of your home environment without switching between screens or apps.
Powered by two standard AAA batteries included in the box, the AirGuard TH can be placed on any surface using the built-in foldout stand, or hung on the wall with a screw. The device is indoor-rated with a PC+ABS housing and certified CE, FCC, and RoHS.
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