General
Operating voltage	4 x 1,5 V AA (LR6) batteries
Current supply	USB Type-C
Indication	E-Paper display
Battery life	over 1 year
Memory	8 MB
Web server	Integrated
Data transmission	Wi-Fi
Setup	Bluetooth
Compatibility	Shelly Smart Control App, home automation platforms, voice assistants
Mounting	On the wall
WLAN
Bluetooth
Integrated clock
Bluetooth
Protocol (Bluetooth)	4.2
RF band (Bluetooth)	2400 - 2483.5 MHz
Max. RF power (Bluetooth)	< 4 dBm
Range (Bluetooth)	Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors , (Depends on local conditions)
Electrical
Power supply	Batteries
Battery type	4 AA (LR6) 1.5 V (not included)
Estimated battery life	approx. 1 year (depending on batteries used, temperature and humidity changes, and network connection strength)
Power supply, USB	Type-C (power adapter and cable not included)
Environmental
Ambient working temperature	0 °C to 40 °C / 32 °F to 105 °F
Humidity	30 % to 70 % RH
Max. altitude	2000 m / 6562 ft
Firmware capabilities
Webhooks (URL actions)	10 with 2 URLs per hook
Schedules
Scripting
MQTT
Microcontroller unit
CPU	ESP-Shelly-C38F
Flash	8 MB
Physical
Size (HxWxD)	70x70x26 mm / 2.76x2.76x1.02 inch (without stand) , 70x70x45 mm / 2.76x2.76x1.77 inch (with stand)
Weight	47 g / 1.66 oz
Mounting	With stand (on a horizontal surface) , Wall mounting (using screws with head diameter 5-7 mm / 0.20-0.28 inch and max 3 mm / 0.12 inch thread diameter or double sided foam sticker)
Shell material	Plastic
Shell color	White
Sensors, meters
Internal-temperature sensor
Temperature sensor
Humidity sensor
Wi-Fi
Protocol	802.11 b/g/n
RF band	2401 - 2495 МHz
Max. RF power	< 20 dBm
Range	Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors , (Depends on local conditions)

The Shelly H&T Gen3 is a WLAN-based sensor for measuring humidity and temperature, designed for intelligent building automation. The device is manufactured by Shelly and is part of the Plug&Play family, which operates without a central control unit (Hub). It is suitable for monitoring indoor climate conditions in living rooms, bedrooms, bathrooms, or other interior spaces where a stable and healthy environment is to be ensured. The sensor enables remote control and monitoring via the Shelly Smart Control App as well as various home automation platforms and voice assistants. It features an integrated web interface accessible through a browser and establishes a connection to the WLAN network to transmit data.

Applications
The Shelly H&T Gen3 is used in living spaces to continuously monitor humidity and temperature. It is particularly useful for preventing dryness or mold growth caused by excessively high or low humidity levels. In children's rooms, it can be used to ensure an optimal sleeping environment by triggering notifications when critical values are reached. In combination with a Shelly Plug, it can be used for intelligent control of heating systems to automatically regulate temperature. It is also suitable for bathrooms or other moisture-prone areas to monitor humidity and ensure healthy room conditions.

Features and Specifications in Detail
The sensor precisely measures ambient temperature and relative humidity. The measured values are transmitted over the WLAN network and can be accessed via the Shelly Smart Control App or the integrated web interface. Data can be stored for up to one year free of charge to enable analysis and statistics. The device features an E-Paper display with low power consumption, which shows current values. The display is always visible without significantly increasing power consumption. The integrated clock enables timestamping of measurement values.

Technology Explained Simply
The Shelly H&T Gen3 is powered either by four 1.5 V AA (LR6) batteries or via a USB Type-C port connected to an external power source. Battery operation provides a lifespan of over one year, achieved through the energy-efficient operation of the E-Paper display. The USB connection ensures continuous power supply, resulting in faster connections and more frequent data transmissions. The device uses a Shelly chip with 8 MB memory, enabling faster responsiveness and more efficient processing. It features an integrated web server accessible via a browser and can be directly integrated into the WLAN network. Setup is done via Bluetooth, with the device starting in setup mode by default and switching to sleep mode after three minutes to save energy.

Compatibility and Accessories
The Shelly H&T Gen3 is compatible with the Shelly Smart Control App, various home automation platforms, and voice assistants. It can be combined with other Shelly devices to create complex automation scenarios. For example, it can be connected to a Shelly Plug to intelligently control heating. The device can also function as a Bluetooth gateway to integrate other Bluetooth-enabled devices into the network. No Hub is required, as the device connects directly to the WLAN network.

Mounting and Installation
The device can be mounted on the wall. Installation is done by inserting four AA batteries into the battery compartment or by connecting to a USB Type-C adapter. Batteries must be inserted correctly, paying attention to polarity (+/-). When using the USB adapter, ensure the cable is not damaged and remove the back cover of the device before inserting the adapter. The device starts in setup mode, which automatically switches to sleep mode after three minutes. To reactivate setup mode, briefly press the reset button.

Advantages in Operation
The Shelly H&T Gen3 offers a long operational life of over one year on battery power, reducing maintenance needs. The combination of WLAN and Bluetooth connectivity allows flexible integration into existing smart home systems. The E-Paper display provides continuous value display without high power consumption. The integrated clock enables timestamping of measurement values, which is useful for trend analysis. Operation without a Hub and direct WLAN network connection reduces installation complexity and increases system reliability.