Sonoff SI7021 temperature and humidity sensor

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High accuracy temperature and humidity sensor compatible with Sonoff TH10 and TH16.

SKU: SON-KIE-SI7 Category:


Sonoff SI7021 is a combined temperature and humidity sensor capable of triggering temperature or humidity based switching of Sonoff TH10 and TH16 smart relay switches. Due to its durability it operates with high accuracy and stability even in long term. Comes with built-in temperature and humidity chips, that connects to a high performance 8-bit MCU. Cost efficient, high quality and high responsivity solution to temperature and humidity detection and temp-hum based automated control. The sensor has 2.5 mm 4-pin (stereo audio-like) connector, that fits to Sonoff TH10 and TH16 connection sockets.

The sensor should be plugged into the smart switch before power-on. It is not advised to plug or unplug the sensor after power-on.

With the help of eWeLink mobile app you can create any temperature or humidity based settings that trigger automated turn ON / OFF of TH10 and TH16 relays, or other connected devicessuch as a S20 smart socket. Perfect choice to control ventillators, electric heaters, radiators, humidors, dehumidifiers, air conditioners, sprinklers, aquariums.

Product features:

  • Sonoff SI7021 temperature and humidity sensor has an approx. 50 cm long cable.
  • Accuracy of temperature sensor: ±0,4°C (in a -10-85°C range)
  • Accuracy of humidity sensor: ±3% RH (0-80% in case of RH)


Sonoff SI7021 sensor is recommended to other products:

  • Sonoff TH10 WiFi-equipped smart switch relay, remotely controllable via Internet the lower output version (2200W, 10A),
  • Sonoff TH16 WiFi-equipped, smart switch relay remotely controllable via Internet, with higher output than TH10 (3500W, 16A).

Additional information

Weight 0.026 kg
Dimensions 50 cm
Product type

temperature and humidity sensor


2,2 – 3,6V

Operating temperature range

-40 – +85 ͦC

Supported humidity range


Brand / Manufacturer


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