Shelly Shelly_H&T_G3_s H&T Gen3 Matte Black WLAN temperature and humidity sensor S3SN-0U12A content_copy

The Shelly H&T Gen3 Matte Black is a WLAN-based sensor for measuring air temperature and humidity, specifically designed for use in residential and building environments. The device enables precise monitoring of environmental conditions and is part of a comprehensive building automation system. It features an integrated E-Paper display showing the current measurement value and can be controlled and monitored without an additional hub via the Shelly Smart Control App or various protocols such as MQTT and REST-API. Control is via WLAN, and the device is compatible with voice assistants and other home automation platforms. Power supply is either via four 1.5 V AA batteries (not included) or a USB Type-C adapter (cable not included), with battery consumption kept so low that a lifespan of up to one year is expected.

Applications
The sensor is intended for indoor use, particularly in living and office spaces, where continuous monitoring of room climate conditions is important. It is suitable for integration into intelligent heating and ventilation systems, for example to automatically adjust room temperature or humidity. The measurement values can be used to control radiators, fans, or air conditioning units to ensure a healthy and comfortable indoor climate. Wall mounting is possible, allowing flexible placement in various rooms.

Functions and Features in Detail
The device features an E-Paper display, which extends battery life due to its low power consumption. The display shows the measured temperature and can also display the status SEt in setup mode. The integrated clock enables time-based control and logging of measurement values. Control is via an embedded web interface accessible through a web browser, as well as via the Shelly Smart Control App. Firmware can be updated via the web interface or the app, with the decision to install updates left to the user. The device supports up to 10 webhooks, each with two URLs, enabling integration with external systems.

Technology Explained Simply
The Shelly H&T Gen3 is based on an ESP-Shelly-C38F processor with 8 MB flash memory, ensuring fast responsiveness and sufficient storage for firmware and applications. Communication occurs via WLAN in the 2400–2495 MHz frequency band with maximum transmission power sufficient for stable connections indoors and outdoors. WLAN range is up to 50 meters outdoors and up to 30 meters indoors, depending on local conditions. Bluetooth 4.2 is also supported, with a range of up to 30 meters outdoors and up to 10 meters indoors. In sleep mode, the device consumes at most 32 µA, and up to 76 mA in setup mode. Power supply is either via batteries or USB Type-C, with the device not to be used for charging rechargeable batteries.

Compatibility and Accessories
The device is compatible with the Shelly Smart Control App, MQTT, REST-API, and various home automation systems. It can operate without a hub and is designed for use with other Shelly devices to enable seamless climate automation. Integration with voice assistants is possible, although specific platforms are not specified. The device can be powered by USB Type-C adapters, which are not included in the package. Batteries (4 x AA, 1.5 V) are also not included.

Installation and Mounting
Installation is done by inserting batteries into the designated compartment or connecting to a USB Type-C adapter. Batteries must be inserted correctly, paying attention to polarity (+/-). When changing batteries or connecting the USB adapter, the back cover must be removed, and the USB cable must be disconnected beforehand. The device starts in setup mode, which automatically switches to sleep mode after three minutes. Setup mode can be reactivated by briefly pressing the reset button. Configuration is done via the integrated access point (AP), which is enabled by default.

Advantages in Operation
The sensor is characterized by long operational life and low power consumption, reducing maintenance needs. The integrated web interface and app control enable flexible and centralized monitoring. The E-Paper display provides clear, continuously visible value display without heavily taxing the batteries. Compatibility with various protocols and platforms offers flexibility when integrating into existing systems. Wall mounting allows flexible placement, and the device can operate without an additional hub, simplifying installation.

General
Degree of protection	not specified
Operating voltage	4 x 1.5 V AA (LR6) batteries or USB Type-C
Battery life	up to 12 months
Power consumption in standby mode	≤32 µA
Power consumption in setup mode	≤76 mA
Frequency band	2400 - 2495 MHz
WLAN range outdoors	up to 50 m
WLAN range indoors	up to 30 m
Bluetooth protocol	4.2
Bluetooth range outdoors	up to 30 m
Bluetooth range indoors	up to 10 m
CPU	ESP-Shelly-C38F
Flash memory	8 MB
Webhooks	10
Indication	E-Paper display
Web server	Integrated
Operation temperature	0 °C to 40 °C
Air humidity	30 % to 70 % RH
MQTT
REST API
Integrated clock
Reset button
Wall mounting
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)

---