🔍 I check the received model

The CR2450 battery is present in the box, it is announced for 4 years of battery life! (to be confirmed over time of course). It is new and protected by a tongue.

🌡 Operating Temperatures

• Operating temperature: -10 °C to 60 °C

📊 Quick comparison: Sonoff SNZB-02P vs. other models

Model	Average price	Battery type	Fastening	LCD display	Compatibility	Autonomy announced
Sonoff SNZB-02P	€14-16	CR2450	Double sided + magnetic plate	No	Zigbee2MQTT / HA	4 years
Aqara T/H	22–26 €	CR2032	Double-sided	No	Zigbee2MQTT / HA	2 years
Sonoff SNZB-02D	18-22 €	AAA	Double sided + magnetized support	Yes	Zigbee2MQTT / HA	2 years

🛒 Where to buy this equipment?

Here is the link to the page dedicated to SNZB-02P. I referenced the sellers and prices.

📦 First impressions and installation

The battery is large (CR2450), supposed to last 4 years. It is new and protected by a tongue. This sensor can be attached with the double side provided, but there is also a metal plate and a magnet for fast, clever and non-drilling installation – I love this system (already adopted on the SNZB-02D for the interior).

The product looks promising, to be seen over time for autonomy and reliability.

🔗 I integrate the sensor with Zigbee2MQTT

I put Zigbee2MQTT in pairing mode, I remove the tab from the … battery but the pairing goes wrong, I start again, mistake again. Finally, I press the sensor button for a long time and then the pairing starts correctly.

The sensor is recognized as an SNZB-02P, perfect, and the battery goes up immediately (which is rare and appreciable).

🏠 I find the sensor in Home Assistant

I go to Home Assistant and find my equipment. Integration is immediate, temperature and humidity are present.

Values seem reliable.

⚙ Some ideas for simple automations

Thanks to this sensor, I can:

• Receive a notification if the temperature drops below 16 °C in a room
• Turn on an additional heater automatically in case of cold
• Send a humidity alert if >70 % in the bathroom

All this can be accessed in just a few clicks via Home Assistant, no code to write.

💡 Good to know: tips and advice

• Pairing problem? Feel free to press the button for a long time and bring the sensor closer to the Zigbee coordinator.
• Battery at 100 % immediately? This is rare, take advantage of it, but monitor over time to verify the reliability of the measure.
• Magnetic fastening : convenient to move the sensor without damaging the walls.

💬 My opinion after commissioning

For less than 15 €, the Sonoff SNZB-02P is an excellent choice to track temperature and humidity, with very practical fixing and record theoretical autonomy. The Zigbee2MQTT and Home Assistant integration is worry-free once pairing is started.

This product is promising, yet to be monitored for autonomy and reliability over time.

📑 For archive: instructions for use (good luck!)