Sonoff-C AirGuard TH Lite Zigbee Temperature & Humidity Sensor | SNZB-02B
Sonoff-C AirGuard TH Lite Zigbee Temperature & Humidity Sensor | SNZB-02B
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Sonoff AirGuard TH Lite Zigbee Temperature & Humidity Sensor | SNZB-02B
The SONOFF AirGuard TH Lite (SNZB-02B) is a compact Zigbee 3.0 temperature and humidity sensor. It uses a Sensirion sensor with ±0.2°C temperature and ±2% RH humidity accuracy, refreshes its readings every 5 seconds, and also calculates dew point and VPD (vapour pressure deficit).
At only 27.8 mm wide and 20 mm thick, it fits into tight spots, and it runs on two AAA batteries for up to 2 years.
Color: White
Accurate, Fast Readings: Temperature is measured to ±0.2°C and humidity to ±2% RH, with new data every 5 seconds, so changes in a room, cabinet or greenhouse show up quickly in the app.
Dew Point & VPD: Besides temperature and humidity, the app shows dew point and VPD. Dew point helps you spot condensation risk that leads to mould on walls, while VPD is useful for keeping the right conditions for plants.
Comfort Alerts & Automation: Set your own comfort range and get an alert when it is exceeded, or create smart scenes that switch on a fan, dehumidifier or other device automatically.
6-Month History: View temperature, humidity, dew point and VPD trends for up to six months in the app to follow long-term changes.
Slim Design, Easy Batteries: The sensor measures 66.3 × 27.8 × 20 mm, can be hung with its lanyard or stuck in place with adhesive, and uses two standard AAA batteries that you can replace without tools.
Who it's for / Works with: Monitoring rooms, wardrobes, wine racks, humidors, terrariums or greenhouses. SONOFF lists these Zigbee hubs: SONOFF ZBBridge-P, ZBBridge-U, NSPanel Pro and iHost (eWeLink app); Home Assistant via ZHA or Zigbee2MQTT with a SONOFF ZBDongle-P, ZBDongle-E, Dongle-M, Dongle-PMG24 or Dongle-LMG21; Aeotec SmartThings Hub (V3); and Amazon Echo (Plus 2nd Gen, Echo 4th Gen, Show 2nd Gen).
Good to know: A Zigbee hub is required. It is an indoor sensor and is not waterproof. SONOFF states that Philips, IKEA and FRITZ!Box gateways are not supported.
Technical Specifications
| Specification | SNZB-02B |
|---|---|
| Product name | AirGuard TH Lite (AirGuard series) |
| Model | SNZB-02B |
| MCU | TLSR8656 |
| Wireless | Zigbee 3.0 (IEEE 802.15.4) |
| Input | 3.0V (2 × 1.5V batteries) |
| Battery | 2 × AAA (LR03), up to 2 years |
| Temperature accuracy | ±0.2°C / ±0.4°F |
| Humidity accuracy | ±2% RH |
| Refresh rate | Every 5 seconds |
| Net weight | 43.0 g (with batteries) |
| Dimensions | 66.3 × 27.8 × 20 mm |
| Casing material | PC |
| Application | Indoor |
| Operating temperature | -20°C to 60°C |
| Operating humidity | 5–95% RH, non-condensing |
📄 User manual: Download the official SONOFF SNZB-02B user manual (PDF)