SONOFF AirGuard SNZB-02M Temperature and Humidity Sensor

Improve your environment with the SONOFF AirGuard SNZB-02M smart sensor that monitors temperature, humidity and air pressure. The device offers 5 measurements in 1, including dew point and VPD calculations, and provides detailed information about the current indoor climate. Zigbee 3.0 communication allows you to integrate the sensor into your smart home system and create automated scenarios that respond to changes in environmental conditions.

Comprehensive monitoring of environmental conditions

SONOFF AirGuard SNZB-02M allows you to monitor key environmental parameters in real time. The sensor measures temperature, humidity, and atmospheric pressure, and additionally calculates dew point and VPD values, providing a more complete picture of indoor conditions. Monitoring air pressure also allows you to observe changes that may indicate changes in weather conditions.

Accurate measurements and quick alerts

High measurement accuracy allows you to detect even the smallest changes in the environment. The sensor measures temperature with an accuracy of ±0.2 °C, humidity with an accuracy of ±2% RH, and pressure with an accuracy of ±0.1 hPa. Users can set desired temperature, humidity, and pressure ranges and receive instant notifications in the app when these limits are exceeded, allowing them to quickly respond to changing conditions.

Zigbee smart automation

Support for the Zigbee 3.0 standard allows the sensor to connect to other smart home devices via a Zigbee hub. Based on current readings, you can create automated scenarios, such as turning on a fan, humidifier, air conditioner, or opening windows when certain conditions are detected. This solution allows you to automatically adapt your environment to your current needs.

Stable communication and long battery life

Zigbee 3.0 wireless communication ensures stable operation with compatible devices and allows flexible placement of the sensor in any desired location. It is powered by a single CR2477 battery, which provides more than 2 years of operation, so the device does not need frequent battery replacement. The absence of wires allows installation in various locations, such as shelves, corners, near windows or on ceilings.

Wide range of uses in various spaces

SONOFF AirGuard SNZB-02M is ideal for any environment where monitoring indoor environmental conditions is important. It can be used in the living room, children's room, bathroom or greenhouse to maintain the appropriate temperature and humidity. Thanks to the automation functions, it can also support the management of devices responsible for ventilation, heating or humidity control.

Compact design and easy installation

The small body measuring 45 × 45 × 17.6 mm allows the sensor to be installed in many places without taking up much space. The device weighs 27.3 g including the battery and is made of PC plastic. The kit includes mounting accessories such as a metal plate, 3M double-sided adhesive tape and a mounting screw, allowing you to customize the installation method to the chosen location.

Included in the kit

• SONOFF Temperature and Humidity Sensor
• Battery CR2477
• Metal mounting plate
• 3M double-sided adhesive tape
• Fixing screw
• Key
• User manual

Warranty: months

The text is machine translated.

It is important to know

When choosing a smart temperature and humidity sensor, it is most important to understand its place in the existing ecosystem and how it will connect. Before purchasing, ask yourself whether you already have a suitable control panel and what integration options you need for your smart home. Particular attention should be paid to the requirements for additional equipment and the long-term possibility of expanding the system, which is not evident from the basic technical data.

• This sensor only works as part of a system with a central control unit (e.g. ZigBee hub), so it is not suitable for standalone use or without a suitable existing control unit.
• Connecting via ZigBee means lower load on the home WiFi network and greater reliability in larger smart systems, but requires a dedicated hub.
• This type of solution is more effective for easily upgrading a home with multiple sensors, but for a smaller system or completely standalone use, prior equipment verification is required.
• It delivers suitable results where local autonomy and scalability are important, but requires a bit more planning during initial setup.

Source of editorial recommendations: ENAA guides and team experience.

In practice

🟢 Monitoring temperature and humidity in multiple rooms

The sensor is excellent for monitoring the living environment in different rooms, as it allows centralized monitoring via a suitable smart home system.

🟡 Use without a pre-installed control panel

The sensor is not suitable for direct use if you do not have an existing ZigBee control panel - without it, it cannot be connected or included in automation.

🟢 Operation in larger or more complex smart homes

ZigBee connectivity contributes to a stable and scalable system where you want to manage multiple different devices and sensors in one place.

🟡 First steps in a smart home

For beginners, using this sensor is possible, but it will require an additional investment in a control panel - especially suitable if you plan to expand the system.

Answers to frequently asked questions

Does the sensor work without a special hub/controller?

No, it requires a connection to an appropriate control panel or ZigBee hub to function.

Can the sensor be integrated with popular smart systems?

The possibility of integration depends on the support of your control panel - check compatibility with the ecosystem before purchasing.

Is the sensor occupying my WiFi network?

No, it uses the ZigBee protocol for connection and does not connect directly to a WiFi network.

Is the sensor suitable for monitoring multiple rooms?

Yes, in connection with the control center, you can monitor data from multiple rooms at the same time.

Description updated: October 2026

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