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 (2-Pack)

Funcionaba muy bien y fácil de instalar

I can now track the wattage of appliances in my home so I can use push notifications when they finish.

Easy to pair and get it working. Alexa, lights on, Alexa lights off! This plug is very handy! I am going to use it for my Christmas tree when its time! Looking forward to not having to struggle with the outlet each night.

Works great right out of the box. Using the Ewelink software, you are presented with all the parameters and easily connects to Alexa. Just change the name during the configuration to prevent Alexa from getting her tung tied up in a knot. The only downside is that unlike other Sonoff boards, the serial connection points on the board does not have through hole pads. Several flashers have damaged the pads trying to hook up the connections for flashing alternative software. Very good value for money

I like my smart devices not relying on external servers. So if the device is WiFi then I make sure I can flash it with tasmota. These are easy to disassemble and the flashing is not too difficult. Unfortunately the tax, RD, find, and vc are not pass through and are only pads but it is not too difficult to solder pigtails for flashing. I would prefer if the plug receptacle was on the side instead of the front.

After four months two of the four units stopped working. They still function you can turn them on and off with the button however they will not connect to Alexa app, which makes them useless to me. (Edit) All 4 have stopped working now. Have replaced with Govee outlets that function just fine. This is a horrible product !! Stay away.

I want to confirm that this product (SONOFF S40 WiFi Smart Plug) works with 220v-240v, I asked this question here in this product page if it supports 240v but all answers I got were guess work saying that it might not work (I wonder why people answer if they dont know), guesstimate was not the answer I was looking for, when it is written 110v I too can understand it might not work. I bought this one (knowing the risk of it not working) to use in my home country Nepal where electricity is on average 230v. So, yes this one worked successfully in 230v, I hope my answer will help people like me who will be looking to know about this issue.

Disappointed. It wouldnt connect to phone. Based on what I read in email, it will only work if you use alexa or google or other platforms. I didnt want any platform. I just wanted it connected to my phone and it wouldnt do it. I spent 3 hrs working on it. Not worth my time. Their are other brands that are more friendly then this crap.

Flash these switches with the OpenSource Tasmota firmware to unlock the full potential of these switches. With Tasmota, there is no cloud dependency, no phoning home, no privacy risk. You can use this switch as a standalone device by accessing the Tasmota web page. Alternatively, Tasmota on this switch provides full integration with MQTT for use with HomeAssistant or OpenHab. I have five of those switches with Tasmota installed and they are bulletproof. The remote control of the switch is great, but the real-time power monitoring is just awesome. I use these switches to monitor amperage and wattage draw of 3D printers. Plus, these are great for any hardware you wish to remote switch.

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. Theyre 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. Im 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. Lets be frank. Id 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 Im definitely not itching for a new and different cloud solution or app. Id 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 homes energy use, especially now that theyre 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. Ive pushed some of mine well up to the limits and havent had any major problems or sparks fly. Out of a couple dozen, Ive 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 dont lose any granular Home Assistant data because of this, nor are they ever inaccessible and fail to turn on/off. I dont have a good answer as to why different units behave differently with the same software. Odd behavior, but it doesnt result in problems. I really cant complain anyway, Im using them well outside of the manufacturers 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 wouldnt cinch down some of the poor-quality screws like they are Shee-Ra or the Hulk. Ive destroyed way more screws than Ive wanted, and thats with the perfect screw removal tool which Ive 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. Ive 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 Ive put into these Sonoff S31 units will eventually pay for themselves. Its fairly easy for me when Im paying almost $0.25 per kilowatt hour, others might not have as good of an ROI. If anything, Ive achieved some level of energy usage consciousness. Ive killed and/or automated quite a few parasitic energy draws I wasnt even aware of, and have easily increased my automation abilities at the same time. Its 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 - were talking about a ~50 watt constant load just to monitor outlet energy. For me, Ive killed and automated much more than that, so Im in the black as it were. Its important, at least for me, to keep tabs on the cost and value of energy monitoring. Im 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 dont 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 dont 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.