SONOFF SNZB-02DR2 ZigBee Smart Temperature and Humidity Sensor (2-pack)

The Sonoff AirGuard TH SNZB-02DR2 is a smart temperature and humidity sensor featuring ZigBee technology and a large 3.6” LCD display, which shows current conditions, daily highs and lows, and air comfort levels in real time. It combines laboratory-grade accuracy (±0.2 °C / ±2 % RH), modern wireless connectivity and energy-efficient battery operation in a single compact device. Thanks to this, you always know whether the room has a healthy microclimate – no guesswork, no assumptions, no unnecessary complications.

Clear and large 3.6” LCD display The clear, high-contrast display is designed so that the most important data is visible even from a distance. A single glance is all it takes to check the temperature, humidity, minimum and maximum values for the past 24 hours, and the graphical comfort indicator. You don’t need to open any app or reach for your phone – the information is always at your fingertips, exactly when you need it.

Precise, premium-class sensor – Sensirion SHT40 At the heart of the device is the professional Sensirion SHT40 sensor, renowned for its use in industrial and measurement applications. It provides exceptionally stable and reliable data, which translates into real benefits: better sleeping conditions, healthier air for children, and protection for plants, food and wine against excessive humidity. This is a device that measures accurately – because when it comes to comfort, there’s no room for chance.

ZigBee 3.0 – smart wireless automation Thanks to its ZigBee 3.0 connection, the sensor operates reliably, responds quickly and consumes minimal energy. Once paired with the gateway, you can monitor data, set alerts and create automations in the app – for example, switching on a humidifier when the air is too dry, or activating ventilation when humidity is too high. This is a smart home that takes care of your comfort all by itself, even before you notice a problem.

Data history and analytics AirGuard TH records measured values and displays them in the form of clear graphs, allowing you to track changes over time – down to the minute. Daily, weekly and multi-year statistics are available, as well as information on dew point and VPD. This is a practical tool that will help you better plan ventilation, heating and plant watering, and effectively prevent mould and excessive humidity. Integration with your smart home system
The sensor integrates seamlessly with popular platforms and hubs: Sonoff, Home Assistant, Zigbee2MQTT, SmartThings, as well as voice assistants such as Alexa and Google Home, and the Matter Bridge ecosystem. You can control the temperature using voice commands, view data remotely and switch the device on from anywhere. This gives you complete freedom and flexibility, regardless of which ecosystem you’ve chosen.

Proximity Mode – use it even without a gateway
Don’t have a ZigBee hub? No problem. In Proximity Mode, you can connect directly to your smartphone via Bluetooth to check current settings, calibrate the sensor, switch between °C and °F, or export data. It’s the ideal solution for those who want to start with simple monitoring and expand the system with automation later on. Compact design and versatile use
Thanks to its slim casing made from durable PC+ABS material, power supply via two AAA batteries, and the option to stand it upright or hang it, the AirGuard TH fits literally anywhere – in the bedroom, children’s room, greenhouse, pantry, cellar, storeroom or office. A wide operating range (-20 °C to 60 °C, 5–95% relative humidity) ensures reliability in a variety of conditions. This small device gives you excellent control over the comfort and safety of your environment every day.

Technical specifications: Device type: Smart temperature and humidity sensor (ZigBee + Bluetooth)
Wireless connectivity: ZigBee 3.0 (IEEE 802.15.4) + Bluetooth (proximity mode) Display: 3.6" high-contrast LCD Data shown on the display:
Current temperature Current humidity Minimum and maximum values over 24 hours Comfort indicator Battery status Sensor: Sensirion SHT40 Temperature measurement accuracy: ±0.2 °C
Humidity measurement accuracy: ±2 % RH Temperature measurement range: -20 °C to 60 °C Humidity measurement range: 5–95 % RH (non-condensing)
Temperature units: °C / °F (switchable) Data logging: Measurement history Graphs, min./max. values Daily and long-term statistics (up to approx. 6 months in the app)
Further analyses in the app: Dew point, VPD, comfort level Alerts: Notifications when temperature and humidity thresholds are exceeded Power supply: 3.0 V DC Battery type: 2 × AAA / LR03 1.5 V
Microcontroller (MCU): TLSR8656F512ET32 Housing material: PC + ABS Colour: White Dimensions: 95 × 70 × 18.2 mm
Weight: 99.3 g (with batteries) Package contents: ZigBee Sonoff AirGuard TH SNZB-02DR2 LCD temperature and humidity sensor ×2 User manual