SONOFF SNZB-02P Zigbee 3.0 Temperature & Humidity Sensor

Always know the climate in your home – accurate to the tenth of a degree.

Is it too dry in the bedroom, causing you to sleep poorly? Is it getting too humid in the bathroom or basement? Or do you always want to keep an exact eye on the temperature in the nursery? The SONOFF SNZB-02P Zigbee 3.0 temperature and humidity sensor gives you real-time insight into the indoor climate of any room in your home.

🇨🇭 Swiss precision: the SHT40 sensor

The heart of the SNZB-02P is the Sensirion SHT40 – a Swiss-made sensor known as one of the most accurate consumer sensors in the world. Its measurement accuracy is:

• >

Temperature:

• ±0.2°C / ±0.4°F >

Humidity:

• ±2% RH >

Refresh rate:

• every

5 seconds

🔔 Comfort Alert – notifications for deviations

Through the eWeLink app, you set a comfort zone for both temperature and humidity. As soon as a value falls outside your set range, you immediately receive a push notification on your smartphone. Ideal for:

• >

Baby or children's room:

• notification if it gets too cold or too warm >

Basement or crawl space:

• alarm for too high humidity (mold prevention) >

Plants or terrarium:

• automatically switch on a mister or heater >

Server room or home office:

• automatic notification if it gets too hot

📊 Historical data & graphs

The SNZB-02P stores measurement data in the cloud. Via the eWeLink app, you can view graphs by day, month, or half-year and download the data for further analysis. This gives you insight into trends and allows you to structurally improve the climate in your home.

🔗 Broadly compatible with popular smart home platforms

• >

SONOFF's own hubs:

• ZBBridge, ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost, ZBDongle-P, ZBDongle-E >

Amazon:

• Echo Plus 2nd Gen, Echo Show 2nd Gen, Echo 4th Gen >

SmartThings:

• SmartThings Hub V3, AeoTec Smart Home Hub V3 >

Home Assistant:

• via Zigbee2MQTT or ZHA >

Google Home, Alexa

• and

IFTTT

🏠 Local scenes – even without internet

The SNZB-02P supports local Zigbee scenes. Automations remain active even if your WiFi or internet goes down – the hub switches locally based on the measured values.

🧲 Three mounting options

• >

Double-sided 3M tape

• – directly on any flat surface >

Metal mounting plate + screw

• – for fixed wall mounting >

Built-in magnet

• – click it directly onto any metal surface

💡 Example automations

• >🌡️

Bedroom too hot

• (>22°C): fan turns on automatically via smart plug. >💧

Bathroom too humid

• (>70% RH): ventilation switches on after showering. >🌿

Plants:

• humidity below 40% RH → activate mister. >❄️

Basement:

• temperature below 5°C → send notification to smartphone. >🏠

Energy saving:

• thermostat to eco-mode if window is open (combined with SNZB-04P door sensor).

📦 Technical Specifications

⚠️ Important note

The SNZB-02P has no display – values are only visible via the eWeLink app or a connected platform such as Home Assistant. If you want a sensor with a built-in display, check out the SONOFF SNZB-02D.

❓ Frequently Asked Questions (FAQ)

Do I need a hub?
Yes, a compatible Zigbee hub is required: SONOFF ZBDongle-E, NSPanel Pro, or iHost.

Does the sensor have a display?
No. Values can be read via the eWeLink app or Home Assistant. Choose the SNZB-02D for a display.

How accurate is the sensor?
The Swiss Sensirion SHT40 chip measures at ±0.2°C and ±2% RH – exceptionally accurate for this price range.

How fast is the data refreshed?
Every 5 seconds – always the most current measurement.

Is the battery included?
Yes! Pull out the insulating strip, and the sensor is immediately active.

Can I view historical data?
Yes, via the eWeLink app, you can view graphs by day, month, or half-year.

Does it work with Home Assistant?
Yes, via Zigbee2MQTT or ZHA. Temperature and humidity can be used as triggers for automations.

How do I pair the sensor?
Press and hold the button for 5 seconds until the LED slowly flashes. The sensor will then be in pairing mode for 180 seconds.

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