Sonoff ZigBee Indoor Temperature & Humidity Sensor SNZB-02D Wireless Battery CR2450

The Sonoff ZigBee Indoor Temperature & Humidity Sensor SNZB-02D is a compact wireless detector powered by a CR2450 battery, designed to monitor indoor climate. It features an integrated LCD display and supports Zigbee 3.0 connections for compatibility with most Zigbee gateways and hubs. The device records temperature and humidity data, stores up to six months of cloud data with hourly resolution, and allows data export as files for review.

Advantages

The sensor provides accurate hourly measurements and shows highest and lowest values by hour or day. It supports instant mobile alerts via the eWeLink app when temperature or humidity exceed user-defined thresholds. With Zigbee 3.0 compatibility and Home Assistant support through the eWeLink add-on, it integrates into existing smart home systems. It offers up to 120 m (400 ft) coverage in ideal, unobstructed conditions and includes three mounting options for flexible installation.

Suitable for

• Home rooms where temperature and humidity need monitoring
• Nurseries and baby rooms
• Server cabinets or small equipment enclosures
• Greenhouses and indoor plant areas
• Integration into Zigbee smart home setups and Home Assistant

Key specifications

• Model: SNZB-02D
• Power: CR2450 battery (included) with up to 2 years battery life
• Display: LCD
• Dimensions: 59.5 mm (W) × 62.5 mm (H)
• Wireless: Zigbee 3.0 compatible
• Cloud storage: Up to half-year (hourly data resolution)
• Wireless range: Up to 120 m / 400 ft (no obstructions, ideal conditions)

How to use

Insert the CR2450 battery and place the sensor in the desired indoor location. Pair the device with a Zigbee 3.0 gateway or compatible hub following the gateway’s pairing procedure. Install the eWeLink app, add the sensor and enable notifications to receive instant alerts when measurements exceed your set thresholds. Optionally, add the device to Home Assistant via the eWeLink add-on for automation and scene control.

Recommendations

Position the sensor away from direct heat sources, drafts or direct sunlight to ensure accurate readings. For best wireless performance, avoid heavy obstructions between the sensor and the Zigbee gateway and choose the mounting option (stand, wall or magnet) that suits the installation location.