Sonoff SNZB-02B AirGuard TH Lite Zigbee 3.0 Temperature Humidity Sensor

Product Description:

The Sonoff SNZB-02B AirGuard TH Lite is a battery-operated temperature and humidity sensor that communicates via Zigbee 3.0. It measures the ambient temperature and relative humidity and additionally calculates the dew point and vapor pressure deficit (VPD).

The sensor uses a high-precision Sensirion sensor element with a temperature accuracy of ±0.2 °C and a relative humidity accuracy of ±2%. The measurement data can be transmitted to the Zigbee network at intervals of up to 5 seconds. It operates with two AAA batteries, which can provide a lifespan of up to 2 years, depending on network quality and the configured transmission interval.

The measured values can be displayed as charts in the eWeLink app, exported in CSV format, and used to trigger automations. The display of dew point and VPD values is particularly useful in applications that require more precise monitoring of humidity, such as in air conditioning, humidity control, mold prevention, or in plant cultivation environments.

Additional Features:

Compatibility

Zigbee 3.0: The sensor is compatible with SONOFF Zigbee gateways as well as many other Zigbee 3.0-based systems such as Home Assistant (ZHA, Zigbee2MQTT), SmartThings, and Amazon Alexa Zigbee hub solutions.

Installation

Flexible mounting: Thanks to its compact size and battery-operated design, the sensor can be installed without a fixed power supply. It can be mounted on the wall, placed on a flat surface, or hung with the included hanging strap.

Smart Features

Real-time monitoring: Real-time monitoring of temperature and humidity as well as calculation of dew point and VPD.

Data logging: The history of temperature, humidity, dew point, and VPD can be viewed in the eWeLink app.

Notifications: Notifications when the measured values leave the configured comfort range.

Technical Specifications:

Model: SNZB-02B

Operating mode: Zigbee temperature and humidity sensor

Power supply: 2 × 1.5 V AAA batteries

Expected battery life: Approx. 2 years

Wireless connectivity: Zigbee 3.0, IEEE 802.15.4

Temperature accuracy: ±0.2 °C

Humidity accuracy: ±2% RH

Operating temperature: -20 °C to +60 °C

Operating humidity: 5–95% RH, non-condensing

Dimensions: 66.3 × 27.8 × 20 mm

Weight: 43 g (including batteries)

Material: PC plastic

Color: White

IP protection class: Splash-proof (IP44)

MCU: TLSR8656

Product category: Sensor