Sonoff Zigbee AirGuard Lite

Monitor Your Environment Before Small Changes Become Big Problems

Track temperature, humidity, dew point, and VPD with a compact Zigbee temperature and humidity sensor designed for smart homes, indoor growing, storage, and sensitive spaces.

✔ ±0.2°C Temperature Accuracy
✔ ±2% RH Humidity Accuracy
✔ 5-Second Data Refresh
✔ Dew Point & VPD Monitoring
✔ Up to 2 Years Battery Life
✔ 6-Month Historical Data
✔ Zigbee 3.0 Connectivity

Built for guitar cases, cigar humidors, jewelry cabinets, wine racks, indoor gardens, storage areas, and other spaces where environmental conditions matter.

Built for Accurate Monitoring, Designed for Smarter Control

Temperature and humidity can change without you noticing. A storage cabinet can become too humid, an indoor growing area can move outside its preferred conditions, or a room can develop temperature changes throughout the day.

The SONOFF AirGuard TH Lite SNZB-02B gives you real-time environmental information without taking up valuable space. Its industrial-grade Swiss Sensirion sensor provides temperature accuracy of ±0.2°C and humidity accuracy of ±2% RH, with readings refreshed every 5 seconds.

Connect it to a compatible Zigbee hub or coordinator, monitor conditions through your smart-home system, and create alerts or automation when readings move outside your preferred range.

Whether you're monitoring plants, protecting stored items, or improving everyday comfort, AirGuard helps you measure instead of guess.

Why Choose the SONOFF AirGuard TH Lite?

Choosing a Zigbee temperature humidity sensor is about more than simply displaying a temperature reading. Accuracy, response time, installation flexibility, battery life, and smart-home compatibility all matter.

AirGuard combines:

Professional-grade Swiss Sensirion temperature and humidity sensing

5-second real-time data refresh

Dew point and VPD calculations for deeper environmental monitoring

Slim 66.3 × 27.8 × 20mm design for compact spaces

Two standard AAA batteries with up to 2 years of typical battery life

Zigbee 3.0 connectivity for compatible smart-home systems

Up to 6 months of historical environmental data through supported eWeLink functionality

Every feature is designed to make environmental monitoring more accurate, convenient, and useful in real-world applications.

Why AirGuard Compared to Basic Temperature Sensors

*Historical data availability depends on the supported ecosystem and eWeLink configuration.

The Difference You Notice Immediately

Accurate Environmental Monitoring

Monitor temperature with ±0.2°C accuracy and humidity with ±2% RH accuracy, with readings refreshed every 5 seconds. This gives you a clearer picture of changing environmental conditions.

See More Than Temperature & Humidity

AirGuard also calculates dew point and VPD, helping you understand environmental conditions in greater detail. This is especially useful for indoor growing, condensation monitoring, and sensitive storage environments.

Monitor Tight, Hard-to-Reach Spaces

At only 66.3 × 27.8 × 20mm, the slim sensor can fit into compact spaces such as guitar cases, cigar humidors, jewelry cabinets, wine racks, and other enclosed areas. It supports adhesive and hanging installation.

Reduce Battery Maintenance

Powered by two standard AAA batteries, AirGuard is designed for up to 2 years of typical battery life, making long-term monitoring easier without frequent battery changes. Actual battery life can vary depending on usage and conditions.

Turn Readings Into Smart Actions

Set preferred temperature and humidity ranges and use compatible smart-home automation to receive alerts or trigger devices such as fans and dehumidifiers when conditions move outside your selected range.

Review Environmental Trends

Access up to 6 months of historical temperature, humidity, dew point, and VPD data through supported eWeLink functionality, allowing you to identify patterns instead of relying only on current readings.

Premium Features

How to Use the AirGuard TH Lite

Using the SONOFF SNZB-02B temperature humidity sensor is straightforward:

Install two standard AAA batteries into the sensor.

Connect the AirGuard TH Lite to a compatible Zigbee hub or coordinator.

Place the sensor in the area you want to monitor.

Use your compatible smart-home platform to view temperature and humidity readings.

Configure your preferred thresholds, notifications, and automation scenes.

Review historical data to understand environmental changes over time.

A Zigbee gateway or coordinator is required. Compatibility and available features depend on the smart-home platform being used. SONOFF documents integration with its ecosystem and compatible third-party/open-source platforms.

Who Is It For?

AirGuard TH Lite is ideal for:

Smart home owners

Home Assistant and Zigbee users

Indoor gardeners and growers

Wine storage enthusiasts

Cigar collectors

Musicians protecting instruments

Jewelry and valuable-item storage

Home offices and bedrooms

Storage cabinets and enclosed spaces

Anyone who wants accurate temperature and humidity monitoring

If you need to know what is happening inside a space without constantly checking it yourself, AirGuard provides a practical way to keep environmental conditions visible.

Important Compatibility Information

The SONOFF AirGuard TH Lite SNZB-02B requires a compatible Zigbee hub or coordinator and does not operate as a standalone Wi-Fi sensor. SONOFF identifies Zigbee 3.0 compatibility and support for a range of smart-home platforms, while specific integrations may have individual setup requirements. For example, SONOFF currently notes that using AirGuard with ZHA requires a script.

The sensor is designed for indoor use and is not waterproof. Do not install it in locations where it can be directly exposed to water or become wet.

Warranty

Warranty coverage is subject to the manufacturer's warranty terms and the seller's applicable conditions.

For the most reliable product support, retain your proof of purchase and follow the manufacturer's installation and operating instructions.

Specifications

*Battery life is a manufacturer-provided typical/theoretical figure and actual performance can vary with usage, firmware, signal conditions, and environmental factors. Historical-data functionality depends on supported ecosystem configuration.

Frequently Asked Questions

Does the SONOFF AirGuard TH Lite require a Zigbee hub?

Yes. A compatible Zigbee hub, gateway, or coordinator is required to connect and use the SNZB-02B within a smart-home system.

How accurate is the AirGuard TH Lite?

The sensor provides temperature accuracy of ±0.2°C / ±0.4°F and humidity accuracy of ±2% RH, with data refreshed every 5 seconds.

Can it monitor dew point and VPD?

Yes. The AirGuard TH Lite calculates both dew point and VPD from its temperature and humidity measurements, providing additional environmental information beyond standard temperature and humidity readings.

How long do the batteries last?

The SNZB-02B uses two standard AAA batteries and is designed for up to 2 years of typical battery life. Actual battery performance can vary depending on usage and operating conditions.

Can I use it outdoors?

No. The AirGuard TH Lite is designed for indoor applications and is not waterproof. It should not be installed where it can be exposed to water.

Take Control of Your Environment

Stop relying on guesswork when temperature and humidity matter. The SONOFF AirGuard TH Lite Zigbee Temperature & Humidity Sensor gives you accurate environmental measurements, fast 5-second updates, dew point and VPD monitoring, historical data, and smart-home integration in a compact design.

Whether you're monitoring an indoor garden, wine rack, instrument case, storage cabinet, or everyday living space, AirGuard helps turn invisible environmental changes into useful information.

Add the SONOFF AirGuard TH Lite to your Zigbee smart-home setup and start monitoring your environment with greater confidence.