Shelly BLU H&T ZB

Shelly documents alerts and notifications when temperature crosses predefined thresholds, used for cases such as preventing frozen pipes in cold weather.

Shelly documents alerts and notifications when humidity crosses predefined thresholds, used for cases such as stopping mold and mildew in basements and bathrooms.

Measures ambient air temperature continuously and reports it over BLE advertising and Zigbee, with a rated ambient range of -20 to 60 degrees Celsius.

Measures relative humidity across the full 0 to 100% RH range.

The specification lists a humidity sensor and a temperature sensor only. Unlike the Display ZB version, there is not even a light sensor on board.

This is the display-less model: its only output is a single red LED, and readings are delivered over Bluetooth or Zigbee. The sibling Shelly BLU H&T Display ZB (SBHT-103C) is the e-paper version.

Bluetooth 5 (LE) on 2402 to 2480 MHz with under 8 dBm of RF power, the radio a Shelly Bluetooth gateway reads the sensor through.

Zigbee end device on 802.15.4, 2405 to 2480 MHz, so it joins an existing Zigbee coordinator rather than hosting a network. Five quick presses of the button start Zigbee pairing.

Scene activation: the readings trigger scenes with other Shelly devices, the documented example being a Shelly Plus 1 wired to a bathroom fan that runs when humidity climbs.

Reached through the Shelly Smart Control account, which the product page lists alongside Alexa, Home Assistant and Samsung SmartThings, and which needs a gateway on the network for this sensor: the Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor.

Reached through the Shelly Smart Control account, which the product page lists alongside Google Home, Home Assistant and Samsung SmartThings, and which needs a gateway on the network for this sensor: the Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor.

The device documentation lists only Bluetooth 5 LE and Zigbee 802.15.4 with no Matter or HomeKit profile, and the platforms Shelly names for it are Alexa, Google Home, Home Assistant and Samsung SmartThings.

Reached through the Shelly Smart Control account, which the product page lists alongside Alexa, Google Home and Home Assistant, and which needs a gateway on the network for this sensor: the Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor.

Zigbee2MQTT supports this exact model (SBHT-203C), exposing battery, temperature, humidity and identify, so it appears in Home Assistant as soon as it joins the Zigbee network.

The device documentation lists only Bluetooth 5 (LE) and Zigbee 802.15.4 as its radios, with no Matter profile. The FAQ on the product page presents Matter as a Gen3 and Gen4 feature, and this is a BLU battery sensor.