Smart Temperature and Humidity Sensor Sonoff SNZB-02B – Zigbee 3.0 Protocol, Precision Measurement, Threshold Alerts, eWeLink and Home Assistant Compatible

Description

Sonoff SNZB-02B is the ideal solution for maintaining an optimal microclimate in your home, office or storage spaces. Thanks to the built-in high-precision Swiss sensor, the device quickly records even the smallest variations in temperature and humidity, providing accurate real-time data.

Running on the Zigbee 3.0protocol, the sensor ensures minimal energy consumption, very low latency in executing local automations and excellent network stability. It is an essential device for making energy consumption more efficient, allowing climate control equipment to be switched on or off automatically only when needed.

Note: This product uses the Zigbee protocol and requires a compatible Zigbee hub/bridge (e.g. Sonoff ZBBridge-P / Sonoff ZBBridge-U / Sonoff ZBDongle-E / Sonoff Dongle-M) to be connected to the network and controlled from the app. It does not work on its own over WiFi.

Key Features & Technical Advantages

• High-precision measurement: Equipped with an industrial-grade internal sensor, it offers high accuracy for temperature (±0.2°C) and humidity (±2% RH) readings.

• Notifications and threshold alerts: You can set minimum and maximum temperature or humidity thresholds in the app. As soon as the values exceed the set limits, you instantly receive a push notification on your phone.

• History and Trend Charts: Lets you view and export the data history (by day, month or year), helping you analyse how the indoor climate changes and how efficient the insulation of your home is.

• Zigbee 3.0 connectivity: Ensures fast communication with the local gateway, independent of the internet connection for running predefined local routines.

• Low consumption & long-lasting battery: Runs on two AAA batteries, offering long battery life and automatic alerts on your phone when the battery level drops.

• Simple and flexible mounting: The small dimensions and the included 3M adhesive pad allow easy fixing on a wall or furniture, or placing directly on a desk.

Ways to Use It and Scenarios

1. Heating / Air Conditioning Automation: Set up a routine in which a Sonoff smart relay (e.g. Sonoff ZBMINI) switches on an electric radiator or the boiler when the room temperature drops below 20°C.

2. Humidity control in the bathroom or basement: Set the extractor fan or a dehumidifier to switch on automatically when the humidity level exceeds 65% RH, preventing damp.

3. Protecting plants in a greenhouse or sunroom: Continuously monitors environmental parameters, and you get an alert on your phone if the temperature drops dangerously low on winter/spring nights.

Technical Specifications

• Brand / Model: SONOFF SNZB-02B

• Sensor Type: Temperature and humidity sensor

• Wireless Protocol: Zigbee 3.0 (IEEE 802.15.4)

• Temperature measurement range: -10°C ... +60°C (Accuracy: ±0.2°C)

• Humidity measurement range: 0% ... 99% RH (Accuracy: ±2% RH)

• Power supply: 2 × AAA batteries (LR03), 3V

• Casing Material: Flame-retardant PC (White colour)

• Mounting: 3M double-sided adhesive tape (included)

• Control App: eWeLink (iOS / Android)

• Ecosystem compatibility: Sonoff iHost, NSPanel Pro, ZB Bridge-P/U, Home Assistant (ZHA / Zigbee2MQTT), SmartThings, Amazon Alexa, Google Home.

Package Contents

• 1 × Sonoff SNZB-02B temperature and humidity sensor

• 2 × AAA batteries (LR03, pre-installed)

• 1 × 3M double-sided adhesive tape

• 1 × User manual and eWeLink / Zigbee setup guide

(Note: A compatible Zigbee 3.0 Hub/Gateway is required for connection and remote access).

Practical use cases

• Installed in a child's room, it sends an alert to your phone if the temperature drops below a threshold, so the heating can switch on automatically.
• Placed in a cellar or pantry, it monitors humidity to prevent mould and protect food.
• Integrated into an automation that switches on the dehumidifier or the bathroom ventilation when humidity exceeds a certain level.

Technical specifications:

The SNZB-02B is the ideal choice for anyone who wants to monitor the temperature and humidity in their home in real time and automate heating or ventilation accordingly.