SONOFF S31/S31 LITE – Compact Design Smart Plug with Energy Monitoring US Standard


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【Remote Control & Timing】Turn on/off connected devices wirelessly via your phone. Supports to set 8 scheduled/cutdown timers for devices.
【ETL Certificated】Secure and guaranteed.
【Voice Control】Works with Alexa and Google Assistant to start a hands-free control.
【Min & Thin】Small and compact body shape, will not block adjacent outlets. Convenient to plug and play.
【Note】Power monitoring, power history record and over-load protection fuctions are S31 only.

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Customer Service Guarantee

SONOFF S31 is a compact and lightweight US standard Wi-Fi smart plug with power monitoring. Both S31 and S31 Lite are ETL certificated, this means they reach the indispensable security and reliability standard that a smart plug must have. Note that power consumption and over-load protection are available for S31. The smart plug lets you control home appliances via eWeLink APP anywhere, anytime. Also, third-party platforms like Amazon Alexa and Google Assistant can seamlessly work with this plug for a voice-controlled home. The small size makes the smart plug will not occupy another outlet of your socket or power strip during, which reserves more space for other plugs. Convenient to use, plug and play. Bring a S31 home, keeping track of the real-time power, current and voltage of your home appliances via APP to view which one is power-hungry and power-saving. You can also measure electricity consumption for a specified period. Besides, Features over-load protection which allows you to set the power, current and voltage value for your appliances, and this smart plug will automatically turn off connected devices in case of reaching any one of the set value. S31 provides you 100 days of historical power consumption data record (support to export) and monthly electricity bill forecast. Monitor and understand which appliances are consuming most, then create scheduled or countdown timers to keep your electricity bill down. For other features like smart scene, sync status, share control, these are the same as S20 smart plug.


  • Turn on/off connected device wirelessly anywhere anytime
  • Provide real-time power/current/voltage of your appliances (S31 Only)
  • Provide 100 day historical power consumption data and electric bill (S31 Only)
  • Set limited power/current/voltage value to auto-off, protect from overload (S31 Only)
  • Device status synchronously display on your phone
  • Support Max 8 enabled scheduled/countdown timing tasks
  • Share Control with your family
  • Works with Amazon Echo, Echo Dot, Amazon Tap
  • Works with Google Home, Google Nest
  • Works with IFTTT(eWeLink Advanced Plan Required)



Additional information

Weight N/A
Dimensions N/A
Max. Current:


Voltage Input:

120V AC 60HZ

Wireless Standard:

2.4GHz, 802.11 b/g/n

Receive Sensitivity:

802.11b: <-84dBm(11Mbps); 802.11g: <-68dBm(54Mbps)

Output Power:

802.11b:16±2dBm; 802.11g:13±2dBm

Security Mechanism:




Working Temp:

-20 °C ~ 75 °C

Working Humidity:


Product Dimensions:




Customer Reviews

Based on 4 reviews
Jérôme Poulin
Easy to setup, lots of features

Using eWelink to set this up took minutes from opening the box to fully working.

Lots of features included for timers, schedules, power limits and history. Really good value for the price.

Original purchased units have been solid

These are the second purchase I made of these devices. The first units, purchased over 2 years ago, are monitoring my washing machine and (gas) clothes dryer. With these units I am able to monitor and get alerts as to when my wash is done. I am even able to get notified if the dryer door is left open.

Terrence Plunkett
Great with Espurna

I buy and use these extensively after putting Espurna on them. They work fine with the included software, I just like connecting to services they don't support and using one central app.

Septien Patterson
Great product that works perfectly. Great integration within Home Assistant.

I use this to monitor the power draw of our washing machine and to send out a verbal notification to all our Alexa devices when the wash cycle is done. Works flawlessly. I highly recommend this product and will purchase more in the future.

SONOFF S31/S31 LITE - Compact Design Smart Plug with Energy Monitoring US Standard