Shelly Shelly H&T Gen3 Matte White - humidity and temperature sensor, white

Shelly Shelly H&T Gen3 Matte White - Smart Wi-Fi Humidity and Temperature Sensor

Device identification

• Device name: Shelly H&T Gen3

• Device model: S3SN-0U12A

• Device SSID: ShellyHTG3-XXXXXXXXXXXX

• Device Bluetooth ID: 0x1809

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Short description

Shelly H&T Gen3 is a smart Wi-Fi humidity and temperature sensor with a large, clear e-paper graphic display.

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Key features

• Wi-Fi connectivity: Connects to your home Wi-Fi network, so you can monitor readings remotely via the app or other devices.

• Large e-paper display: Shows temperature and humidity in a simple, easy-to-read format.

• Digital clock: Time is synchronised automatically via NTP.

• Smart home platform support: Works with Google Home, Amazon Alexa and Samsung SmartThings – enabling voice control and automation.

• USB Type-C port: Allows USB power (does not charge batteries, but provides continuous power).

• Bluetooth connectivity: Used during setup.

• User-friendly interface: The device has a reset button for easy manual configuration.

• Battery operation: Takes measurements at set intervals and only sends data when there is a significant change.

• USB-powered operation: Measures and updates data more frequently and always sends data to the cloud.

• Environmental tolerance: Operates at temperatures from 0 °C to 40 °C and humidity levels of 30%–70% RH.

• Power supply options: Runs on 4x AA batteries (not included) or via USB Type-C.

• Wireless connection: Supports Wi-Fi (802.11 b/g/n) and Bluetooth 4.2 protocols.

• Microcontroller: ESP-Shelly-C38F (8 MB flash memory).

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Main applications

• Private houses

• Residential buildings (apartments, hotels, rental flats)

• Small businesses (shops, offices, restaurants, petrol stations, etc.)

• Universities and colleges

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Smart home integrations

• Amazon Alexa: Yes

• Google Smart Home: Yes

• Samsung SmartThings: Yes

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Electrical interfaces

• USB Type-C port: For powering the device only (does not charge batteries).

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Connectivity

• Wi-Fi: 802.11 b/g/n

• Bluetooth: 4.2

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Measurement and reporting

Battery operation

• Measures every minute

• Updates the display when the change is ≥ 0.2 °C or ≥ 3% humidity

• Sends data only when the change is ≥ 0.5 °C or ≥ 5%

• If there has been no report within 2 hours, sends data unconditionally

• A 5-minute cool-down period prevents distorted readings

USB-powered operation

• Wakes up every 5 minutes

• Measures, updates the display and sends data to the cloud

• Then sleeps for 5 minutes

Manual reporting by the user

• Button press → measures, updates the display, sends data, sleeps for 5 minutes

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Technical specifications

Physical characteristics

• Dimensions (without stand): 70x70x26 mm

• Dimensions (with stand): 70x70x45 mm

• Weight: 47 g

• Mounting:

  • Tabletop (with stand)

  • Wall mounting (with screws or double-sided tape)

• Housing material: Plastic

Environmental conditions

• Operating temperature: 0 °C to 40 °C

• Humidity: 30% to 70% RH

• Maximum operating altitude: 2000 m

Electrical characteristics

• Power supply (batteries): 4x AA (LR6) 1.5 V (not included)

• Battery life: approx. 1 year (depending on usage)

• Power supply (USB): USB Type-C (adapter and cable not included)

Sensors

• Temperature sensor: Yes

• Humidity sensor: Yes

• Internal temperature sensor: No

Radio

• Wi-Fi:

  • Protocol: 802.11 b/g/n

  • Frequency: 2401–2495 MHz

  • RF output power: <20 dBm

  • Range: up to 30 m indoors / 50 m outdoors

• Bluetooth:

  • Protocol: 4.2

  • Frequency: 2400–2483.5 MHz

  • RF output power: <4 dBm

  • Range: up to 10 m indoors / 30 m outdoors

Microcontroller (MCU)

• CPU: ESP-Shelly-C38F

• Flash memory: 8 MB

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Software features

• Schedules: No

• Webhooks (URL actions): 10 (up to 2 URLs each)

• Scripting: No

• MQTT support: Yes

User manual: Shelly H&T Gen3 multilingual printed user and safety guide.pdf Manufacturer's website: Shelly H&T Gen3