This easy to read Zigbee temperature and humidity smart sensor has a large 3.6" LCD and a built in stand.
AirGuard TH is a Zigbee temperature and humidity sensor designed for clear, at-a-glance indoor climate monitoring. Its large 3.6-inch LCD displays real-time temperature and humidity, along with 24-hour highs and lows. Powered by two AAA batteries (included), it features a built-in stand and a wall-mount hook, making it easy to place exactly where you need it around your home.
Get Smart, Automate!
This is a smart sensor, so the fun begins when you hook it up to home automation 🏡✨
Within your home automation setup you can create rules for what happens when the temperature or humidity changes in an area. These rules can trigger notifications or events such as turning a dehumidifier on or off or opening a window. You can also easily, at a glance check the temperature throughout your house and view historical sensor data.
You'll need a Zigbee gateway present on your home network if you want to use the smart features of this device. This could be an iHost or Zigbee Bridge if you want to use Sonoff's eWeLink app. Alternatively you could connect it up to a Raspberry Pi running Home Assistant (or a Home Assistant Green), equipped with a Zigbee dongle.
Features
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Large 3.6" display: The clear LCD shows real-time temperature and humidity readings at a glance, without having to grab your phone.
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Battery powered: Runs on two AAA batteries, with no cables required.
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Long-range performance: Uses the efficient, secure Zigbee protocol for reliable performance and low power consumption.
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Works with eWeLink/Home Assistant*/SmartThings/Alexa: Integrates with compatible Zigbee platforms
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Dual location comparison: Optionally display readings from a second supported sensor when used with eWeLink and a compatible Sonoff gateway.
Tech Specs
| Model |
SNZB-02DR2 |
| MCU |
TLSR8656F512ET32 |
| Input |
3.0V (2*1.5V battery) |
| Battery |
2 x AAA (LR03) |
| Display |
3.6" |
| Zigbee |
IEEE 802.15.4 |
| Net weight |
99.3g (with battery) |
| Colour |
White |
| Dimensions |
95x70x18.2mm |
| Casing material |
PC+ABS |
| Applicable place |
Indoor |
| Working temperature |
-20 ~ 60 °C |
| Working humidity |
5~95% RH non-condensing |
| Certification |
CE/FCC/RoHS |
Resources
Check out the SNZB-02DR2 knowledge centre for technical details, compatibility, troubleshooting and setup tips.
Notes
- *Note that Sonoff say that if you're using AirGuard TH with ZHA (Zigbee Home Automation) integration you will need to install a script. Ours seemed to pair fine without it though!
What is Zigbee?
Zigbee is a wireless standard enabling low-power, secure connections between smart devices. Widely used in home automation for devices like thermostats, sensors, and locks, its energy efficiency allows some devices to run for years on a single coin cell battery.
It has many benefits but the biggest one for us is its local nature, there's no cloud subscription or even internet connection required - everything stays within your home if you want it to. This makes it both incredible secure and also resilient to internet connection outages.
Many big brands have Zigbee supported devices including IKEA, Philips Hue, Tuya, and of course Sonoff. This means you can combine devices from different manufacturers into the same smart home setup ensuring you're not locked in to a single vendor - nice!
With an indoor range of 10–100 meters and extended outdoor coverage, Zigbee’s mesh networking ensures reliable communication, even if some devices go offline. Security features, including encryption and key protection, safeguard your smart home, keeping it secure and under your control.
Learn more about Zigbee on the official Zigbee website.