Shelly - Outdoor IP54 black Zigbee or Bluetooth temperature and humidity sensor Shelly BLU H&T ZB

Shelly BLU H&T ZB – Smart Zigbee & Bluetooth Temperature and Humidity Sensor

The Shelly BLU H&T ZB is a compact, dual-protocol sensor offering precise temperature and humidity monitoring. With Zigbee 3.0 and Bluetooth 5.0, it integrates easily into your smart home system to trigger automations based on climate conditions — all while operating completely locally and securely with encryption.

Key Features

• Real-time temperature and humidity measurements
• Threshold-based alerts to help prevent mould and cold damage
• Supports automations for HVAC systems, dehumidifiers, and alerts
• “Button press” sends updated values manually
• Bluetooth + Zigbee pairing via touch sequences
• Fully local and secure with encrypted communications
• IP54-rated for splash and dust resistance

Technical Specifications – Shelly BLU H&T ZB

• Model: SBHT-203C
• Color: Black
• Dimensions: 37 × 37 × 10 mm
• Weight: 13 g
• Mounting: Flat surface
• Protection: IP54 (dust & splash resistant)
• Temperature range: -20°C to +60°C
• Humidity range: 0% to 100% RH
• Power: 1 × CR2032 battery (included)
• Battery life: Up to 3 years
• Bluetooth: 5.0 LE, up to 30 m range
• Zigbee: 3.0, up to 30 m range
• RF Power: < 8 dBm
• Microcontroller: EFR32MG27 (768 kB flash)
• Interface: 1 button, 1 red LED
• Firmware: Encryption (Yes), MQTT/Webhooks/Scripting (No)

Use Cases

• Trigger heating when temperature falls below 18°C
• Send alerts if humidity exceeds 70%
• Automate fan or dehumidifier activation based on humidity
• Prevent condensation and mould in kitchens, bathrooms, or basements
• Ideal for use with Home Assistant, Zigbee2MQTT, or SmartThings

With reliable sensing, local control, and a discreet design, the Shelly BLU H&T ZB is the perfect sensor for climate-aware automation.