Sonoff SNZB-02UL AirGuard E-Ink TH vs Sonoff SNZB-02WD

A custom comfort range, one of six presets or edited by hand, pushes a phone notification when the reading leaves the band.

Zigbee 3.0 (IEEE 802.15.4) end device. SONOFF lists the ZBBridge-P, ZBBridge-U, Bridge-M, NSPanel Pro and iHost as its own gateways, plus the Aeotec SmartThings Hub V3 and the Zigbee Echo models. Time, date and weather on the screen need a gateway or Home Assistant.

2.9 inch flexible dot-matrix E-Ink panel with a nearly 180 degree viewing angle, readable in bright light. Without a gateway it shows temperature and humidity plus the past 6 hours on a button press.

A single button on the back handles the 6-hour history recall, the temperature unit switch and pairing.

Smart scenes trigger above or below a temperature or humidity threshold, or when the device goes offline, with a false alarm delay. The sensor is a trigger only, never an action.

Six hours of temperature and humidity history on the screen without a gateway, and up to six months of temperature, humidity, dew point and VPD curves in the app or Home Assistant, with CSV export.

View and export temperature/humidity charts in the app

SONOFF lists Alexa temperature and humidity queries, and an Echo with a built-in Zigbee hub (Echo Plus 2nd, Echo 4th, Echo Show 2nd) as a compatible gateway.

eWeLink publishes SONOFF Zigbee sensors to Alexa, the same route the SNZB-02 and SNZB-02P already use, and an Echo with a Zigbee hub can pair it directly

The device is Zigbee, not HomeKit. SONOFF republishes it into the Apple Home app through its own Matter bridges (Bridge-M, ZBBridge-U, iHost, eWeLink CUBE).

SONOFF lists this model among the Zigbee devices its Matter bridges (Zigbee Bridge Ultra, iHost, NSPanel Pro) publish to Matter, which is how it reaches the Apple Home app. Apple Home has no Zigbee radio of its own.

Zigbee2MQTT works out of the box, while ZHA needs the script SONOFF publishes in its help center for the advanced functions such as the remote sensor display and the weather data.

Not a Matter device itself: SONOFF bridges it into Matter through the Bridge-M, ZBBridge-U, iHost or eWeLink CUBE.

The device is not Matter itself: SONOFF lists it among the Zigbee models its Matter bridges (Zigbee Bridge Ultra, iHost, NSPanel Pro) republish into Matter.

SONOFF lists the Aeotec SmartThings Hub V3 as a compatible Zigbee gateway, with a SmartThings temperature and humidity query.

Pairs with a SmartThings hub as a standard Zigbee device using the SONOFF driver

Accuracy of plus or minus 2% RH, refreshed every 5 seconds, with dew point and VPD calculated from the temperature and humidity readings.

Swiss Sensirion sensor, accuracy of plus or minus 0.2 C (plus or minus 0.4 F), refreshed every 5 seconds. Screen and app resolve to 0.1 C.