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The Invisible Guardian In Small Spaces
Zigbee Temperature Humidity Sensor | SNZB-02B
*A Zigbee gateway is needed.
Precision You Can Trust
Equipped with an industrial-grade Swiss Sensirion sensor, data refreshes every 5 seconds to accurately capture changes in ambient temperature and humidity.
Compact Design Fits Anywhere
Compact and exquisite design allows easy placement even in small spaces;
equipped with a lanyard, it can be hung freely anywhere.
Also Fits Perfectly In
Hidden Threats You Can Now Monitor
Supports dew point and VPD monitoring, turning invisible environmental threats into visible data.
Say goodbye to moldy walls—start by monitoring the dew point.
Stop guessing, start measuring—VPD is the grower's true compass
No More "Low Battery" Anxiety
Powered by 2 standard AAA batteries, with a battery life of up to 2 years — no wiring, no charging, just quietly guarding.
- **The battery life data is a theoretical value, obtained from SONOFF's internal laboratory under a specific test environment. Actual use may vary slightly due to product differences, firmware software versions, operating conditions, and environmental factors. Please refer to the actual use.
Intelligent Sensing. Automatic Control
You can freely set your comfort range and customize smart scenes. When the environment exceeds the preset range, you’ll receive an instant alert, and appliances like electric fan and dehumidifier will automatically turn on.
Let The Room Decide, Not The Radiator
Place the sensor where you live. It detects the real room temperature and tells your smart valve when to stop — so you stay comfortable, not just the radiator.
It Remembers The Last 6 Months
Enjoy 6 months of free cloud storage and track temperature and humidity changes at any time. With data export support,
every analysis is backed by solid evidence.
Hands-Free Voice Commands
- *Note: This function requires adding the device to the eWeLink app and syncing it to third-party platforms via cloud-to-cloud integration; This process does not involve direct connection to the third-party gateway.
Works with Apple Home Via Matter Bridge
All solutions integrate SONOFF Zigbee devices into your Apple ecosystem via Matter Bridge, enabling seamless interconnected device control.
Learn More about ZBBridge-U | Learn More about eWeLink CUBE.
Easily Integrates with Open-Source Platforms
Built on the Zigbee 3.0 standard, this device effortlessly connects with a wide range of third-party platforms.
Zigbee Hub Compatibility
Specifications
Specs & User Manual
SNZB-02B (AirGuard TH Lite) is a Zigbee temperature and humidity sensor designed for precise environmental monitoring. It measures temperature and humidity with high accuracy, while automatically calculating dew point and VPD for deeper environmental insights. Data refreshes every 5 seconds for reliable real-time monitoring. Its compact design fits easily into small spaces and supports both hanging and adhesive mounting. Powered by two standard AAA batteries, it offers convenient tool-free replacement. The app provides real-time readings and up to 6 months of historical data trends.
| Product Name | AirGuard TH Lite |
| Product Series | AirGuard Series |
| Product Type | Zigbee Temperature & Humidity Sensor |
| Model | SNZB-02B |
| MCU | TLSR8656 |
| Input | 3.0V ⎓ (2 × 1.5V batteries) |
| Battery Model | LR03 AAA |
| Wireless Connection | Zigbee 3.0 (IEEE 802.15.4) |
| Net Weight | 43.0g (including batteries) |
| Color | White |
| Dimensions | 66.3 × 27.8 × 20 mm |
| Casing Material | PC (Polycarbonate) |
| Application Environment | Indoor |
| Operating Temperature | -20°C to 60°C |
| Operating Humidity | 5–95% RH (Non-condensing) |
| Temperature Accuracy | ±0.2°C / ±0.4°F |
| Humidity Accuracy | ±2% RH |
| Certification | CE, FCC, RoHS |
FAQ
If the Dew Point and VPD curves are not displayed, tap the gear icon in the upper-right corner of the History page to open Settings. Then tap the show/hide icon next to each data type to display or hide the corresponding curves, including Temperature, Humidity, Dew Point, and VPD.
To maximize battery life, ensure the sensor is within the operating range of your Zigbee hub to minimize communication retries.
The SNZB-02B is not waterproof, and it is not recommended for outdoor use in environments where it can be easily exposed to water or moisture.
Specifications
| Brand | Sonoff |
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