Ecobee SmartSensor vs Sonoff SNZB-02WD

For general temperature and humidity monitoring, the Sonoff SNZB-02WD wins with a lower price, a built-in LCD, IP65 weather resistance, humidity sensing and alerts. The Ecobee SmartSensor is better rated with a longer warranty and adds occupancy detection, but it only works as an Ecobee thermostat accessory and skips humidity.

The Sonoff SNZB-02WD is a weatherproof Zigbee sensor with an on-device screen and humidity readings, while the Ecobee SmartSensor is a screenless, proprietary accessory that only feeds temperature and occupancy data to an Ecobee thermostat.

The Sonoff SNZB-02WD carries an IP65 rating for outdoor or damp use and has a built-in LCD display. The Ecobee SmartSensor is indoor-only with no screen.

Zigbee smart home owners who want an affordable, weatherproof sensor with an on-device display for garages, greenhouses, log stores or bathrooms, and who run a Zigbee hub such as ZHA or Zigbee2MQTT.

Ecobee thermostat owners with hot or cold rooms who want occupancy-aware comfort balancing, a long 3-year warranty and a five-year battery. It has no value outside the Ecobee ecosystem.