Sonoff RF (R3) WiFi + RF smart relay switch with DIY mode (REST API)

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Smart relay, remotely controllable via Internet and smartphone, WiFi-equipped, supports 433 MHz radio or remote control, with timer function, 2200W (10A) peak output.

R3 is the 2019 version, comes with the same technical specification, but in DIY mode supports integration with other smarthome systems via REST API.

SKU: SON-REL-RF-R3 Category:
EAN: 6920075725537


Sonoff RF is a smart relay remotely controllable via Internet with timer function, similar to Sonoff Basic, but it features 433 MHz RF/radio control. Its R3 version is the latest 2019 version, which also features a DIY mode, which supports integration with other smarthome/home automation systems through REST API. That is,in DIY mode the device does not connect to the Sonoff/eWeLink cloud and app, but can be controlled via the API.

The device is a WiFi-equipped, 433 MHz radio controllable switch relay, that once wired to any circuit, you can turn ON / OFF any electric devices connected to the same wire. It supports smartphone remote control via iOS (Apple) or Android App, and comes with timer function (scheduled turn ON / OFF). It also features 433 MHz radio remote control.

The device also has a physical button. Share smartphone remote control with your family. It is a perfect solution to smart-control any home appliances that is not neccesary to operate constantly, and have to turn ON / OFF periodically (e.g. aquarium air pump). By using the smart switch you can remotely turn ON any of your appliances even before you are at home, and you can conveniently set a scheduled turn OFF, to save energy and cost.

Product features:

  • Remote ON / OFF – Anytime, anywhere, from now on you can turn all your appliances on and off remotely
  • 433.92 MHz radio remote control or physical button control
  • Mobil App support – Free iOS and Android mobil App: eWeLink
  • Sync status – Check actual relay status (turned ON or OFF) with the mobile App
  • Timer – Various timer functions: single time, scheduled turn on/off, countdown/timer, loop.
  • Share control – Control the device together with your family
  • Scene – Turn ON / OFF a gang of devices with one tap
  • Smart scene – Triggered ON/OFF by temp, hum or other environmental sensors
  • Compatibility – Works perfectly with Amazon Alexa, Google Assistant, IFTTT and Google Nest

Additional information

Weight 0.052 kg
Dimensions 9.1 × 4.3 × 2.5 cm
Product type

smart relay



Number of electric gangs controlled


Momentary switch (Inching)


Physical switch


DIN rail compatible

yes, with Sonoff DR adapter (not included)



433MHz RF remote controllable

yes (remote control not included)

Remotely controllable via internet


Voice control

Amazon Alexa and Google Assistant compatible

Power meter


Schedulers, timers

yes (single time, schedule, timer/countdown)

Smartphone app

features also DIY mode and REST API support (can replace factory app), yes, free app: eWeLink (Android, iOS)


Amazon Echo, Echo Dot, Amazon Tap, Google Home, Google Nest, IFTTT, integrates with other smarthome systems via REST API


90-250V AC, compatible with Hungarian 230V

Maximum power output

2200W (10A)

WiFi wireless standard

802.11 b/g/n (2.4GHz)

WiFi security mechanism


Operating temperature range

0-40 ℃

Supported humidity range


Brand / Manufacturer



CE certificates:



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