Device identification
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Device name: Shelly BLU H&T ZB
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Device model: SBHT-203C
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Device Bluetooth ID: 0x0011
Short description
Shelly BLU H&T ZB is a smart humidity and temperature sensor. It has Zigbee and Bluetooth connectivity ensuring a secure connection with an extended battery life.
Main features
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Long battery life
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Air temperature and humidity reporting
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Splash and dust-resistant
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Compact size
Use cases
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Climate control: Adjust the heating, ventilation, and air conditioning system based on current temperature and humidity levels to maintain a comfortable indoor environment.
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Prevent mold and mildew: Monitor humidity levels to prevent the growth of mold and mildew in spaces like basements and bathrooms. The Shelly BLU H&T can activate ventilation or dehumidification devices when needed.
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Alerts and notifications: Receive alerts or notifications when the temperature or humidity reaches predefined thresholds and prevent issues like frozen pipes in cold weather or excessive moisture.
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Optimizing greenhouse conditions: Optimize conditions for greenhouse plants by adjusting watering systems and ventilation based on humidity and temperature levels.
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Security enhancement: Increase your home protection by detecting unusual temperature changes that might indicate fire or flood.
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Appliance control: Adjust operation of dehumidifiers, humidifiers, and fans based on the current temperature and humidity conditions.
Connectivity
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Bluetooth
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Zigbee
User interface
Inputs
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One push button
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One press: Sends the currently measured ambient temperature in °C, relative humidity in %, and a button-pressed event.
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Four quick presses or 10-second press: Initiates pairing with another Bluetooth device.
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Five quick presses: Activates Zigbee pairing.
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A 30-second press: Performs a factory reset (possible only shortly after inserting the battery).
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Outputs
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One single-color (red) LED
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One flash: The Device sends the current ambient temperature, humidity, and button-pressed event.
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One flash every 2 seconds for 1 minute: The Device enters Bluetooth pairing mode for 1 minute.
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Two flashes every 2 seconds for 1 minute: The Device enters Zigbee pairing mode for 1 minute.
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One long flash: The Device performs a factory reset.
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Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (HxWxD): | 37x37x10 mm / 1.46x1.46x0.39 in |
| Weight: | 13 g / 0.44 oz |
| Mounting | On a flat surface |
| Shell material: | Plastic |
| Color: |
|
| Environmental | |
| Ambient temperature: | -20 °C to 60 °C / -5 °F to 140 °F |
| Humidity: | 0% to 100% RH |
| Electrical | |
| Power supply: | 1x 3 V battery (included) |
| Battery type: | CR2032 |
| Battery life: | 3 years |
| Sensors | |
| Humidity sensor: | Yes |
| Temperature sensor: | Yes |
| Bluetooth | |
| Protocol: | 5 (LE) |
| RF band: | 2402 - 2480 MHz |
| Max. RF power: | <8 dBm |
| Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
| Zigbee | |
| Protocol: | 802.15.4 |
| RF band: | 2405 to 2480 MHz |
| Max. RF power: | < 8 dBm |
| Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
| Microcontroller unit | |
| CPU: | EFR32MG27 |
| Flash: | 768 kB |
| Firmware capabilities | |
| Schedules: | No |
| Webhooks (URL actions): | No |
| Scripting: | No |
| MQTT: | No |
| Encryption: | Yes |
| Other | |
| Supported Devices |
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Components and APIs
Compliance
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Shelly BLU H&T ZB multilingual EU declaration of conformity 2025-11-26.pdf
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Shelly BLU H&T ZB UK PSTI ACT statement of compliance 2025-11-26.pdf
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Shelly BLU H&T ZB UKCA declaration of conformity 2025-11-26.pdf
