$17 Sonoff S31 Wireless Smart Socket Includes Energy Monitoring Function

ITEAD Studio has just launched another Sonoff Smart Home product with Sonoff S31 WiFi smart socket with energy monitoring. Just like Sonoff switches, light bulbs, and their other products, the device can be controlled using eWelink app for Android or iOS, and supports integration with Amazon Alexa, and Google Assistant.

It should be noted that the company only provide a US plug version for now, and so far, there’s no Wiki link, so while it’s likely based on ESP8266 or ESP8285 like their other Sonoff devices, it may not be designed to be easily hackable, although I suspect the electronics may be similar to Sonoff POW switch (TBC).

Sonoff S31 hardware specifications listed by ITEAD:

  • Voltage Input – 90~264V AC, 50/60HZ
  • Max. Current – 16A
  • Max. Power – 4200W (Note package above reads max load: 220V/10A)
  • Gang – 1x US type with ground
  • Connectivity – 802.11 b/g/n WiFi with support for WEP/WPA-PSK/WPA2-PSK
  • Misc – Power button, LEDs
  • Dimensions – 75.7×39.7x32mm
  • Weight – 135g
  • Temperature Range – -20 °C ~ 75 °C
  • Humidity – 10%-80%

The socket also includes overload protection for safety, and once you can install eWelink app for Android/iOS to control it remotely, monitor power consumption, and estimated electricity bill, set timers, and securely share with other users in the home.

The company also highlights the compact design, claiming users will be able to connect two sockets on their 2-gang boxes. If you prefer alternative open source firmware like Sonoff-Tasmota or ESPurna, you’d have to wait or do it yourself since the product is still very new.

Many people on Facebook complain about the lack of EU plug, so hopefully the company will take note and soon offer a compatible version, but in the meantime you can purchase the US version of Sonoff S31 for $16.90 plus shipping on ITEAD Studio store. [Update: Sonoff S31 can also be found for $16.90 shipped on Aliexpress]

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12 Replies to “$17 Sonoff S31 Wireless Smart Socket Includes Energy Monitoring Function”

  1. Incredible yous seem to kbow everything:-D
    But: Wow what a price!
    Living on a lonely island comes with a pricetag 😉

    For that price i can order a (2? 4?) us outlet and 2 boxes of wonpro adapters 😉

    Life would be so easy if the new iec type would be adopted worldwide for 220-240V networks. But so far only Brazil seems to have adopted (a variant of) it.

  2. Or maybe just a switch to install in a junction box…
    I bet you can believe how many (of course they are technically illegal) adapters are flying around in any household

  3. Hmmmmm my previous comment seems to have been swallowed by my browser…

    I just found two outlets one at brack (local online shop) https://www.brack.ch/steffen-wifi-pilot-wlan-zwischenstecker-528173 and a more sophisticated one by edimax at conrad (german online electronics pharmacy) https://www.conrad.ch/de/funk-schalt-und-messsteckdose-innenbereich-3680-w-edimax-smart-plug-sp-2101w-swiss-1550667.html

    Seems big players get better prices in China 😉

    1. I found whole lot more reliable store in Banggood. AliExpress screwed me twice with spurious and counterfeit stuff from their vendors. Not again.

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