The SONOFF AirGuard TH (SNZB-02DR2) is a versatile Zigbee 3.0 smart temperature and humidity sensor featuring a large, high-contrast 3.6" LCD display. It shows both local and – in Zigbee mode – remote sensor values in real time, along with daily minimum/maximum data and detailed historical records. The device offers two modes: Zigbee (for automations via gateway) and Proximity (direct phone connection without a gateway).

Advanced analytics are available in the app, including dew point and VPD graphs. Reporting intervals can be adjusted based on threshold or loop settings, values can be calibrated, and comfort zones can be defined with notifications. In Zigbee mode, the “Remote T&H Display” feature allows the display to show data from another sensor on the same Zigbee network (with compatible SONOFF hub and sensors).

Perfect for home climate monitoring, room-based automations, and energy optimization. Thanks to fast updates (as quick as 2 seconds) and up to six months of history, it provides an accurate snapshot of your indoor environment.

About the SONOFF Brand

SONOFF (ITEAD) is one of the most recognized brands in the DIY smart home space. Their lineup includes Wi-Fi and Zigbee devices such as relays, switches, sensors, and hubs, which offer excellent value and integrate well with eWeLink, Home Assistant, and other platforms.

Key Product Features

• Large 3.6" display: shows local and (in Zigbee mode) remote T&H readings, plus daily min/max at a glance.
• Powerful data analytics: real-time hourly view, daily/weekly/monthly/6-month history, dew point and VPD curves.
• Two-location comparison: view two different sensors (e.g., indoor vs. outdoor) simultaneously in Zigbee mode.
• Flexible reporting: threshold-based or cycle-based intervals for fine-tuned control.
• Proximity mode: direct phone pairing and display via the eWeLink app without a gateway.
• Calibration and comfort zones: adjust sensor readings and define zones with alerting.

Smart Home Protocols & Platform Compatibility

• Modes: Zigbee 3.0 (automation, remote sensor display); Proximity (direct app connection).
• Compatible hubs: SONOFF ZBBridge-P/U, NSPanel Pro, iHost; USB dongles: ZBDongle-P/E, Dongle-M/PMG24/LMG21.
• Open platforms: Home Assistant (ZHA and Zigbee2MQTT – ZHA may require a custom script).
• Ecosystems: Alexa / Google Home / SmartThings – T&H query support (features vary by platform).

Smart Features

• Scenes and automations: trigger actions based on temperature/humidity thresholds; offline alerts supported.
• x show data from another sensor connected to the same Zigbee hub.
• CSV export: export detailed history for further analysis.
• Finer monitoring: temporary 1-minute refresh intervals for higher-resolution charts.

Technical Specifications

• Product / Model: AirGuard TH / SNZB-02DR2
• Type: Zigbee temperature & humidity sensor with LCD display
• MCU: TLSR8656F512ET32
• Power supply: 3.0 V (2 × 1.5 V AAA, LR03)
• Display: 3.6" LCD
• Wireless: Zigbee (IEEE 802.15.4); Proximity mode via eWeLink app
• Dimensions / Weight: 95 × 70 × 18.2 mm; 99.3 g (with batteries)
• Material / Color: PC+ABS; white
• Usage: indoor only
• Operating range: −20 to +60 °C; 5–95% RH (non-condensing)
• Certifications: CE / FCC / RoHS
• Note: ZHA integration may require a separate script; features may vary on third-party hubs.