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White square sensor with e-paper display showing temperature and humidity

Shelly

Shelly H&T Gen 3 White smart sensor

SKU CH-21JK-EJ7R6

Wi-Fi and Bluetooth temperature and humidity sensor with e-paper display, USB-C power and no hub required

  • Connection protocolBluetooth
  • Product colorWhite
  • Product typeTemperature & Humidity

Color White

  • Monitors nursery temperature and humidity for safer sleep conditions
  • Controls bathroom fan automatically when humidity rises to prevent mould
  • Triggers heater before temperature drops for comfort and energy efficiency
  • Operates without a hub using built-in Wi-Fi and Bluetooth connectivity
  • Displays readings on low-power e-paper screen with integrated clock

Smart sensor for home climate monitoring

The Shelly H&T Gen 3 measures indoor temperature and humidity and reports the data over Wi-Fi and Bluetooth without a separate hub. A built-in e-paper display shows the current readings and a clock while drawing minimal power from a rechargeable cell charged via USB-C. Its compact white case is designed for wall mounting in any room.

Suits households wanting automated comfort

Families with infants can set alerts to keep nursery conditions within a safe range. Bathrooms benefit from automatic fan activation when humidity rises, and heaters can be triggered before temperatures drop. Buyers who need a sensor that works with a proprietary hub-only ecosystem or who require hard-wired power should look at other options.

Dual Wi-Fi and Bluetooth radios with USB-C charging

Connectivity uses both Wi-Fi and Bluetooth protocols so the sensor can join a home network and pair locally for setup or direct control. The USB-C port recharges the internal battery, removing the need for disposable cells. No other wireless standards or wired interfaces are provided.

How it compares

Measured against everything we stock in Alarm Kits & Motion Sensors, at today’s prices. Recalculated every night.

Price $31.99
Typical for this category: the median of 180 items is $30.99.

Specifications

Product
Product colorWhite
Product typeTemperature & Humidity
Connectivity
Connection protocolBluetooth

Other versions of this model

3 more in the same range

Questions about this item

How often will the battery in the Shelly H&T Gen 3 need replacing?

The sensor is designed for low battery consumption, though the exact interval depends on reporting frequency and wireless signal strength.

What stops the sensor from logging data continuously during a week-long heatwave?

Battery capacity and the wireless duty cycle limit how long it can sustain high-frequency reporting without a recharge.

Does the e-paper display or the wireless radios produce audible noise or heat during continuous operation?

The e-paper display is passive and the low-power Wi-Fi and Bluetooth radios generate no audible noise or perceptible heat.

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