Sonoff SNZB-02DR2 AirGuard TH vs Sonoff SNZB-02UL AirGuard E-Ink TH

Comfort range thresholds push a notification from the eWeLink app when the reading leaves the band

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 end device on IEEE 802.15.4. The full feature set (remote access, scenes, alerts, remote temperature display) needs a gateway such as the ZBBridge-P, ZBBridge-U, NSPanel Pro or iHost, or a ZBDongle running Zigbee2MQTT or ZHA

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 physical button on the back handles wake-up, the temperature unit and pairing

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

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 months of records with average, max and min curves by day, week, month and half year, plus calculated dew point and VPD, and CSV export

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.

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

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.

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

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 Google Home voice queries for both temperature and humidity

SONOFF lists a Google Home temperature and humidity voice query, reached through the eWeLink cloud-to-cloud link.

Supported by Zigbee2MQTT, and by ZHA with the script SONOFF publishes in its help center

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 ZBBridge-U and eWeLink CUBE

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

SONOFF lists the Aeotec SmartThings Hub V3 as a compatible Zigbee gateway, with temperature and humidity voice queries on SmartThings

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

Accuracy 2% RH over 0 to 100% RH, resolution 1% RH on the screen and 0.1% in the app

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

Sensirion sensor, accuracy 0.2 C over the -20 to 60 C range, resolution 0.1 C

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.