SONOFF SNZB-02D Zigbee LCD Smart Temperature Humidity Sensor Wireless Hygrometer Thermometer Alexa Google Home Alice
Networking
“The SONOFF SNZB-02D is a Zigbee 3.0 temperature/humidity sensor with a 2.5‑inch LCD and CR2450 coin battery. Specific attributes: a 2.5-inch black & white display plus a Silicon Labs Zigbee SoC; temperature accuracy ~0.2°C and humidity ~±2–5% (calibration supported). Good for local display and Home Assistant/Zigbee2MQTT integration, but expect occasional reporting hangs and the need to calibrate humidity for accurate readings.”
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Large local LCD lets you read temperature and humidity without an app.
cnx-software.com2.5-inch black&white display
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Zigbee 3.0 compatibility integrates cleanly with ZHA, Zigbee2MQTT and Sonoff hubs.
raspberry.tipswork out of the box with both
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Temperature and humidity can be calibrated via Zigbee2MQTT/Home Assistant for accuracy.
zigbee2mqtt.iotemperature_calibration, humidity_calibration
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Supports OTA firmware updates to improve reporting and reliability.
zigbee2mqtt.ioThis device supports OTA updates
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Uses common CR2450 coin cell—easy to replace without tools.
smarthomescene.comsingle CR2450 button battery
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Reports event-based (temp change 0.2°C, humidity change 5%) and adjustable reporting interval.
raspberry.tipsreport as soon as the temperature changes by 0.2 C
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Sensor can stop reporting and may require force-remove, restart, and re-pair to fix.
zigbee2mqtt.iosensor gets stuck and stops reporting
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Humidity shows an offset (~5% in tests) and often needs user calibration.
raspberry.tipsoffset of around 5% compared to the reference device
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Battery life depends on reporting interval; frequent reports will reduce the CR2450 lifespan.
cnx-software.comgood for about 2 years with a 5-second polling rate