Search  for anything...
SONOFF

SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home Assistant, IFTTT Supporting, 2.4 Ghz WiFi Only (4-Pack)

    • Based on 1,979 reviews
Condition: New
Checking for product changes
$28.87 Why this price?
Save $9.12 was $37.99

Buy Now, Pay Later

As low as $7 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 5 left in stock, order soon!
Fulfilled by Amazon
Arrives May 30 – Jun 1
Order within 11 hours and 36 minutes
Available payment plans shown during checkout

Recently Viewed

Size: S31 4-Pack


Features

  • [Monitor Energy Consumption]:Keep track of real-time power, current and voltage of your appliances on App.and Measure your appliances power consumption for 100-day daily/monthly energy usage data and total electricity cost.
  • [Smart Remote Control Plug]: You can remotely/timely control ON/OFF any connected home appliance via APP eWeLink on your smart phone or tablet. No distance/time limitation.
  • [Set time schedules for the lights and home appliances]: You can set countdown/single/repeat timers to auto-turn on/off the WiFi controlled outlet on App. One tap ON/OFF Energy Saving.
  • [Share control of devices to others]: You can simply share control of your home appliances to others so that they can also turn on/off the devices remotely.

Operation Mode: Off


Current Rating: 15 Amps


Operating Voltage: 120 Volts


Contact Type: Normally Open


Connector Type: Plug In


Brand: SONOFF


Item Dimensions LxWxH: 3 x 2 x 1.02 inches


Actuator Type: Push Button


International Protection Rating: 50


Specification Met: ETL


Operation Mode: ‎Off


Current Rating: ‎15 Amps


Operating Voltage: ‎120 Volts


Contact Type: ‎Normally Open


Connector Type: ‎Plug In


Brand: ‎SONOFF


Item Dimensions LxWxH: ‎3 x 2 x 1.02 inches


Actuator Type: ‎Push Button


International Protection Rating: ‎50


Specification Met: ‎ETL


Control Method: ‎Remote


Connectivity Protocol: ‎Wi-Fi


Unit Count: ‎4.0 Count


Manufacturer: ‎SONOFF


Part Number: ‎S31


Item Weight: ‎12.6 ounces


Product Dimensions: ‎3 x 2 x 1.02 inches


Item model number: ‎S31


Is Discontinued By Manufacturer: ‎No


Size: ‎S31 4-Pack


Batteries Included?: ‎No


Batteries Required?: ‎No


Date First Available: February 20, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: May 30 – Jun 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Own Over 25 Of Them, Tasmotized And Mostly Happy
Size: S31 2-Pack
Review Image by J. Whiteside J. Whiteside
Review Image by J. Whiteside J. Whiteside
Review Image by J. Whiteside J. Whiteside
Like many other reviewers, I have purchased this particular switch to install Tasmota on. I use them for energy monitoring, and in some cases their "original intent" - outlet switching, in my home. I buy whatever pack is cheapest per unit at the time, be it 1, 2 or 4 pack versions. They're all the same in my experience. To get them installed with Tasmota, I first tried to solder leads to them. Then I tried to solder pin headers and that was a little bit easier. I'm slightly beyond entry level skill with soldering, but I destroyed at least three units in this learning process. I finally graduated to micro-grabber electrical test clips and have ripped through over two dozen conversions now without incident. Let's be frank. I'd rather Sonoff just offered Tasmota OS from the get-go, or made these over-the-air flashable. I will settle for nothing less than local control and I'm definitely not itching for a "new and different cloud solution or app." I'd prefer not to hack these devices in the first place and if Sonoff works towards preventing this from a hardware or software standpoint, I will buy no more of them. At the time of this writing (March 2022), this is probably one of the cheapest way to get local energy monitoring and basic 15 amp capable on/off outlet switching. I use Home Assistant for my home automation platform. These are fully compatible with their new "energy monitoring" dashboard. This provides me with significant insight into my home's energy use, especially now that they're widely distributed to the overwhelming majority of my outlets. I usually capture between 13-18 kilowatt hours per day, the bulk of my usage. To be clear, I use "higher grade" energy monitoring switches in "mission critical" applications (furnace, fridge, etc.), but these are great even for non-mission critical high amp usage scenarios up to 15 amps. I've pushed some of mine well up to the limits and haven't had any major problems or sparks fly. Out of a couple dozen, I've had one actual device failure. Oddly enough, even with different firmware, different units operate differently on my WiFi. Some stay connected to Wifi 100% of the time, others intermittently connect throughout the day. I don't lose any granular Home Assistant data because of this, nor are they ever inaccessible and fail to turn on/off. I don't have a good answer as to why different units behave differently with the same software. Odd behavior, but it doesn't result in problems. I really can't complain anyway, I'm using them well outside of the manufacturer's intended use. Build quality is "good enough" but I wish there was a bit more consistency. Since the majority of buyers are intending to hack these, I really wish they wouldn't cinch down some of the poor-quality screws like they are Shee-Ra or the Hulk. I've destroyed way more screws than I've wanted, and that's with the "perfect screw removal tool" which I've determined to be a 2.0mm flathead screwdriver. Again, I just wish I could buy a decent quality, super cheap, 15 amp capable smart switch product with the OS of my choice out of the gate. I've used these to solve VERY REAL problems in my home. From triggering outlets based on other inputs to making serious dents in energy conservation, I believe the $200ish dollars I've put into these Sonoff S31 units will eventually pay for themselves. It's fairly easy for me when I'm paying almost $0.25 per kilowatt hour, others might not have as good of an ROI. If anything, I've achieved "some level" of energy usage consciousness. I've killed and/or automated quite a few parasitic energy draws I wasn't even aware of, and have easily increased my automation abilities at the same time. It's important to know that these utilize about 2 watts each, just to function. This might not seem like much, but with two+ dozen of them running 24 hours a day - we're talking about a ~50 watt constant load just to monitor outlet energy. For me, I've killed and automated much more than that, so I'm "in the black" as it were. It's important, at least for me, to keep tabs on the cost and value of energy monitoring. I'm hoping I can continue to use these to save at least $500 in energy in the next 5 years, and so far, that seems to be a reasonable goal based on how I use them. Lastly, I don't want to get too much into minutia, but you need a fairly robust WiFi network to support the "internet of things" over WiFi. Personally, I utilize multiple networks, including Lutron, Z-Wave, Zigbee and WiFi to get there. Put simply, I don't use these "cheap and ubiquitous" hacked WiFi devices to service mission critical applications in any way. If a failure would cost me a fair bit of money, I spend more than $10 to capture energy usage and (sometimes) provide switching capabilities. +4 stars for being a hackable and very useful device overall. You can debate about that last star, even I waver between 4 and 5 stars. They provide much value for not much dollar and a reasonable +/-2 year path to return on investment for many people that are trying to optimize energy consumption or provide local, automated switching controls. ... show more
Reviewed in the United States on March 20, 2022 by J. Whiteside J. Whiteside
    • Easy setup on 2.4g wireless with a great app with lots of features
Size: S40 4-Pack
I've been through quite a few "smart plugs" and always found that they kinda suck. The software sucks, they are a pain to configure, etc. But these worked really well. Plug it in, add device, it finds it almost immediately, give it a 2.4g network name/password (will not work with 5g), and its done. Super simple and fast. I was happy with that. They have firmware and an easy update process, it only took maybe a minute, that was nice. It has schedules, timers, integration with alexa, google home, IFTTT, SmartThings, Alice, so its pretty awesome like that. You can also share the plugs with others, letting multiple people monitor usage, turn stuff on/off, etc. It has push notifications, offline alerts, logs, can start on/off when power given. Monitoring looks at wattage, voltage, and amperage. Appears to be integration with their other products, so I'll look into that. I got my first 4 for $20 vs $30, and they seemed good at that value. I dropped 1 star as $7.50+tax per plug seems kinda high. I didn't hook it to my Alexa, because they annoy the hell out of me and I wanted the power consumption monitoring more than the app integration. ... show more
Reviewed in the United States on September 26, 2023 by ERIC S SMITH
    • Handy little device
Size: S31 4-Pack
I opted to flash these smart plugs with the Tasmota firmware. Flashing was pretty much straight forward and provided some additional functionality that the Sonoff firmware doesn't provide. The quality of the plug is exceptional with no problems encountered.
Reviewed in the United States on October 21, 2023 by Reilly's Dad
    • The SONOFF S31 is great after you flash it with tasmota
Size: S31 4-Pack
Pros: Flashable Affordable Easy to use Compatible with Amazon Alexa, Google Assistant, and IFTTT Power monitoring feature Cons: Too big it cover 2 gauge outlets Not as fast as some other smart plugs Does not support 5GHz Wi-Fi To flash a Sonoff S31 with Tasmota, you will need the following: A Sonoff S31 smart plug A USB to TTL adapter A micro USB cable A computer with a terminal emulator Once you have gathered your materials, follow these steps: Disconnect the Sonoff S31 from power. Open the Sonoff S31 and expose the PCB. Locate the GPIO0 button and the TX and RX pins. Connect the TX pin of the USB to TTL adapter to the RX pin of the Sonoff S31. Connect the RX pin of the USB to TTL adapter to the TX pin of the Sonoff S31. Connect the ground pin of the USB to TTL adapter to the ground pin of the Sonoff S31. Connect the 3.3V pin of the USB to TTL adapter to the 3.3V pin of the Sonoff S31. Connect the USB to TTL adapter to your computer. Open a terminal emulator and set the baud rate to 115200. Enter the following command to enter bootloader mode: Press the GPIO0 button and hold it down. While holding down the GPIO0 button, plug the Sonoff S31 into a power outlet. Release the GPIO0 button after a few seconds. The Sonoff S31 should now be in bootloader mode. Use the terminal emulator to upload the Tasmota firmware to the Sonoff S31. Once the Tasmota firmware has been uploaded, the Sonoff S31 will reboot. The Sonoff S31 will now be running Tasmota. ... show more
Reviewed in the United States on June 5, 2023 by nj28sharp

Can't find a product?

Find it on Amazon first, then paste the link below.