Wireless Smart 3V Round ZigBee Temperature and Humidity Sensor eWeLink (Sonoff SNZB-02P)
Improve your living comfort and gain complete control over your home climate with the advanced wireless smart 3V ZigBee eWeLink round temperature and humidity sensor (SNZB-02P). This extremely compact, aesthetically pleasing and highly accurate sensor is a key building block of any modern smart home. It allows you to monitor room conditions in real time and automate other smart devices for optimal energy efficiency and comfort.
Thanks to the advanced ZigBee 3.0 protocol, the sensor seamlessly connects to the most popular smart home platforms such as eWeLink, Tuya, Alexa and Google Assistant (via the appropriate ZigBee bridge). Forget about frequent battery changes and complicated installation - this sensor offers years of worry-free operation in an extremely compact form.
Why choose the Sonoff SNZB-02P ZigBee smart sensor?
Monitoring temperature and humidity in your living or working space has never been so easy and reliable. The SNZB-02P sensor brings cutting-edge measurement technology directly into your home. Whether you want to protect sensitive plants, optimize heating performance, or prevent mold growth due to excessive moisture, this device provides data you can rely on.
Key advantages and benefits for the user

Exceptional measurement accuracy: The sensor measures temperature with a deviation of only ±0.2 °C and humidity of up to ±2% RH, providing you with extremely accurate data for managing your living environment.
Fast real-time refresh: Data is refreshed every 5 seconds after each detected change, allowing your smart system to respond immediately to changes in the environment.
Incredible battery life: The built-in CR2477 (3.0 V) battery provides up to 4 years of operation, meaning minimal maintenance and long-term peace of mind.
Smart scenes and automation: Through the app, you can easily create scenarios that automatically turn on the air conditioner, humidifier, or smart heating at a certain temperature or humidity.
Data security comes first: The device uses an advanced AES-128 security encryption system, ensuring that all data transferred within your network is completely secure.
Easy to mount anywhere: Thanks to the included 3M sticker, metal plate and screw, you can mount the sensor on a wall, furniture or any other surface in seconds.

Technical specifications and features
The sensor is characterized by high-quality construction made of durable ABS material and compact dimensions, which allow for discreet installation in any room. See detailed technical specifications below:



Model / SKU
057375 or SNZB-02P


Color
White


Shape
Round


Input voltage
3.0V


Battery type
CR2477


Microcontroller (MCU)
EFR32MG22


Certificates
CE/FCC/ISED/RoHS


Dimensions
45 x 45 x 17.7 mm


Weight
26.7g


Material
ABS


Pairing time
180 seconds


Security mode
AES-128


Purpose of use
Interior spaces


Operating temperature
-10°C ~ 60°C


Operating at high altitude
Up to 5000 m



Perfect integration into your smart home
The SNZB-02P sensor operates via the ZigBee 3.0 protocol, which means that it requires a compatible ZigBee gateway (hub) to operate. When connected to your system (e.g. eWeLink, Tuya), unlimited management options open up. In the app, you can monitor measurement history, export data for analysis, and set up push notifications to your smartphone when values exceed or fall below the set comfort limit.
Package contents:

1 x Smart Sensor SNZB-02P
1 x Switch
1 x Mounting screw
1 x 3M double-sided mounting sticker
1 x Metal plate

Frequently Asked Questions (FAQ)
1. Does the sensor require a ZigBee gateway (hub) to function?
Yes, the sensor requires a compatible ZigBee 3.0 gateway (such as Sonoff ZigBee Bridge, eWeLink or Tuya compatible gateway) to operate and connect to a smartphone and other devices.
2. How long does the battery in the sensor last and what type does it use?
The sensor uses a powerful CR2477 (3.0 V) battery. Thanks to the extremely energy-saving ZigBee protocol and advanced chip, the battery ensures continuous operation for up to 4 years.
3. Can I use the sensor outdoors?
This sensor is designed and certified primarily for indoor use (operating range -10°C to 60°C). Outdoor use is not recommended unless the device is completely protected from direct exposure to water, moisture, and extreme weather conditions.


Responsible persons:
sonoff - INNPRO Robert Błędowski Sp. z o. o., Rudzka 65c, 44-200 Rybnik, Poland, contact@innpro.eu (+48) 696 323 914
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

Instructions for using the product:
• Battery installation
• Open the housing and insert a 3V battery (e.g. CR2477).
• Connection to a smart bridge (hub)
• Make sure you have a ZigBee 3.0 bridge (gateway) connected to the eWeLink / Tuya app.
• Press and hold the button on the sensor to enter pairing mode.
• In the app, select "Add ZigBee device" and follow the instructions.
• Sensor installation
• Place it anywhere you want or attach it with the included adhesive tape.
• Checking operation
• Check in the app that the temperature and humidity data is updating correctly.

Useful tips:
💡 Automate heating or cooling – set a smart switch to turn on the heater or air conditioner based on the temperature. 💡 Check the air quality in the child’s room – adjust the humidity using a smart humidifier. 💡 Prevent mold in the bathroom – set the dehumidifier to activate when the humidity exceeds a certain value. 💡 Use a sensor in the basement or pantry – monitor the storage conditions of sensitive items. 💡 Connect the sensor to Alexa or Google Assistant – check the temperature and humidity with a voice command.

Warnings:
⚠️ Works only with ZigBee 3.0 bridge - the device does not work independently.⚠️ Make sure to insert the battery correctly - observe the polarity.⚠️ Do not expose to water or moisture - the sensor is not waterproof.⚠️ Avoid extreme temperatures - operation is optimal at normal room temperatures.⚠️ We recommend using original batteries for a longer device life.

Same summary

This ZigBee SNZB-02P smart temperature and humidity sensor is suitable for users who want reliable climate monitoring in indoor spaces such as living rooms, bedrooms or offices. Urban households and smart automation enthusiasts will appreciate the connection via ZigBee, which allows for central control in larger smart systems. Therefore, it is recommended to check before purchasing whether you already have a ZigBee central in your home, as this sensor requires a connection to it to function. For those looking for a completely standalone solution without additional equipment, this model may not be the easiest to set up for the first time, but it offers better upgradeability for a smart home in the long run.

Recommendation source: Enaa guides and team experiences.

User view

Typical users of this type of sensor are those who want to enrich their smart home with reliable temperature and humidity control - whether for better sleep, monitoring plant conditions or monitoring the space when you are not at home. It is important for users that the sensor can be integrated into a larger ZigBee system, thus enabling automation, for example, turning on ventilation or heating based on a detected change in climate.

A large portion of users choose Sonoff products because they value their accessibility, compatibility, and broad support in the smart ecosystem.

Why buy at Enaa

When shopping at Enaa, you can expect proven products and up-to-date information about the most popular smart solutions, plus professional support from a team that is well-versed in the practical challenges of setting up smart homes.

Answers to frequently asked questions

Does the ZigBee SNZB-02P smart sensor work without a ZigBee hub?

No, a ZigBee hub is necessary for operation, as this is the only way to transfer data to your smart system.

Is the sensor suitable for outdoor use?

This sensor is designed for indoor use and is not suitable for exposure to weather conditions.

Which smart systems can this sensor be connected to?

The sensor is compatible with the eWeLink system and other ZigBee hubs that support the corresponding protocol - it is recommended to check compatibility with your devices beforehand.

Do I need to set up any special automations to use it?

Automations are not necessary for basic monitoring, but most users set them up for personalized climate adjustments or notifications in the event of sudden changes in temperature and humidity.

What happens if there is no internet connection?

Data between the sensor and the control center is transmitted locally via a ZigBee connection, which means that basic operation does not depend on the internet, but a connection is still required for remote access to information.

Description updated: April 2026