Device identification
- Device name: Shelly BLU H&T ZB
- Device model: SBHT-203C
- 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
- Long battery life
- Air temperature and humidity reporting
- Splash and dust-resistant
- Compact size
Use cases
- Climate control: Adjust the heating, ventilation, and air conditioning system based on current temperature and humidity levels to maintain a comfortable indoor environment.
- 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.
- 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.
- Optimizing greenhouse conditions: Optimize conditions for greenhouse plants by adjusting watering systems and ventilation based on humidity and temperature levels.
- Security enhancement: Increase your home protection by detecting unusual temperature changes that might indicate fire or flood.
- Appliance control: Adjust operation of dehumidifiers, humidifiers, and fans based on the current temperature and humidity conditions.
Connectivity
- Bluetooth
- Zigbee
User interface
Inputs
- One push button
- One press: Sends the currently measured ambient temperature in °C, relative humidity in %, and a button-pressed event.
- Four quick presses or 10-second press: Initiates pairing with another Bluetooth device.
- Five quick presses: Activates Zigbee pairing.
- A 30-second press: Performs a factory reset (possible only shortly after inserting the battery).
Outputs
- One single-color (red) LED
- One flash: The device sends the current ambient temperature, humidity, and button-pressed event.
- One flash every 2 seconds for 1 minute: The device enters Bluetooth pairing mode for 1 minute.
- Two flashes every 2 seconds for 1 minute: The device enters Zigbee pairing mode for 1 minute.
- One long flash: The device performs a factory reset.
Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (H×W×D) | 37 × 37 × 10 mm / 1.46 × 1.46 × 0.39 in |
| Weight | 13 g / 0.44 oz |
| Mounting | On a flat surface |
| Shell material | Plastic |
| Color | Black, Mocha, Ivory |
| Environmental | |
| Ambient temperature | -20 °C to 60 °C / -5 °F to 140 °F |
| Humidity | 0% to 100% RH |
| Electrical | |
| Power supply | 1× 3 V battery (included) |
| Battery type | CR2032 |
| Battery life | 3 years |
| Sensors | |
| Humidity sensor | Yes |
| Temperature sensor | Yes |
| Bluetooth | |
| Protocol | BLE 5 |
| RF band | 2402 – 2480 MHz |
| Max. RF power | < 8 dBm |
| Range | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (Depends on local conditions) |
| Zigbee | |
| Protocol | IEEE 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 (Depends on local conditions) |
| Microcontroller unit | |
| CPU | EFR32MG27 |
| Flash | 768 kB |
| Firmware capabilities | |
| Schedules | No |
| Webhooks (URL actions) | No |
| Scripting | No |
| MQTT | No |
| Encryption | Yes |
| Other | |
| Supported Devices | - Shelly Plus / Gen3 / Gen4 series - Shelly Pro series |
Components and APIs
Compliance
- Shelly BLU H&T ZB multilingual EU declaration of conformity 2025-11-26
- Shelly BLU H&T ZB UK PSTI ACT statement of compliance 2025-11-26
- Shelly BLU H&T ZB UKCA declaration of conformity 2025-11-26