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)

Works for medium to large size appliances, but smaller devices that use 5V power (most USB style devices or small devices), do not register on the devices power monitor. It goes to 0.1W, so if your device uses 1W or less, its near impossible to get a positive this device is definitely using power answer from the power monitor data (for use in home automation). All that being said, the connectivity and setup was very solid.

Tried for days to pair and almost returned them. Most only searches so older versions of the app and the app is not intuitive at all. It is very picky with how your wifi is set up. The Name(ssid) and passwords Can Not have any spaces or special characters. This was a challenge because we are not able to change these without have to re setup all our other devices. Some are security cameras that are very difficult to get to (26 high and 1/4 mile from our router). Our router is only 2.4ghz but the app kept acting as though we were trying to connect to a 5ghz router. Ultimately we had to add a Guest Account named Letters only and set the password with the same restrictions (which makes for a very weak password). Once paired...whew, It seems to be working. The app does Not give the level of detail I was hoping for. It only provides total daily power usage or instantaneous usage. I wanted to see what time the refrigerator defrost heater came on, for how long and how much power it used but the app doesnt do this. With all this considered it is a good value and we may even buy more now that we are able to pair them. One star deducted due to the app, not the switch itself. Although, if the devices continues to work well over time without loosing connectivity or failing we will update to full 5 stars. We were able to determine the fridge pulls about 1amp/120watts while the compressor is running and a total usage of about 0.9kw over 24hrs. The hair drying on high heat and fan pulls over 13amps/1600watts which is almost the max rating of the device. Be careful not to overload. Only ran for a moment so cant speak to how long it can handle this level of current draw. Lastly the basic math calculation is not 100% accurate which should be very easy to accomplish. Volts x Amps = Watts. The device measures the amps and the volts and calculates the watts. They were reasonably close but not perfect. See image attached, should be 126 watts.

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.

I use for dehumidifier, Steamer, Online media box. I use for coffee maker to start 8 am. Surprised it made coffee 12pm lunch time. Too many ads in the app. For 4$ each. And Wi-Fi. CAnt beat the price but not perfect.

I bought a 4 pack of the S40 plugs and had 2 dead out-of-the-box. The other 2 paired up, and worked for just over 24 hours. I woke up to find these 2 flashing my lamps on and off. The app showed them both off-line. Button pressing on the plugs had no effect. When I unplugged them, the button lights would not light up when plugged back into the wall socket. I tried contacting the manufacturer, received a fairly quick response, and was advised to return them to Amazon. I did, and requested a replacement. I received the replacement, and had 1 die within 6 hours. The other 3 lasted almost 48 hours. This morning I found my lamps flashing on and off again. I am sending these back and can not recommend these.

I am sure that others have been able to connect to this device, but I cannot. I followed the instructions exactly. I changed my wifi settings to 2.4. I have the router four inches from my phone and the device. I had order four of these devices awhile back but just got to the point where I needed to install for smart plugs so I tried just now to connect them. I went through every one and nothing. I have connected plenty of smart devices in my home. I am afraid that it was money wasted. If you buy these, I hope you have better luck than I.

Great smart switch from an excellent company. These are rated at 15 amps and they monitor power usage also. Fully compatible with Alexa. And have an excellent control application. If youre into Home Assistant you can easily flash these with Tasmota and goto the next level. Highly rated A+

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.

Once I realized these are not a plug-n-play type of smart plug that requires third-party software I returned them immediately.

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.