Shelly BLU H&T Display ZB vs Sonoff SNZB-02UL AirGuard E-Ink TH

The Shelly Smart Control app sends real-time notifications and runs scenes built on the readings this sensor reports, which the documentation describes as automating humidifiers and ventilation from room humidity.

The Shelly Smart Control app sends real-time notifications and runs scenes built on the readings this sensor reports, which the documentation describes as automating heating and ventilation from room temperature.

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 802.15.4, so it joins an existing Zigbee coordinator rather than hosting a network.

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.

The clock segment can be switched to show the date, in DD.MM or MM.DD depending on the temperature unit selected.

The screen displays the date once the device is connected to a gateway or Home Assistant.

E-paper graphic display showing temperature, humidity, light level, battery, radio status and a clock, with a color inversion option.

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.

Built-in digital clock with 12 or 24 hour format, synchronized automatically over Bluetooth through a Shelly gateway or over Zigbee.

The screen displays the current time once the device is connected to a gateway or Home Assistant.

All on-device control goes through a single physical button.

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

Temperature, humidity and light level readings trigger scenes with other Shelly devices, for lighting, heating, fans, humidifiers, blinds and curtains.

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.

Zigbee2MQTT supports this exact model (SBHT-103C), exposing battery, temperature, humidity, light level and the dark and bright thresholds.

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.

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

The third sensor on board is a light sensor reporting dark, twilight and bright, not a presence sensor.

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.