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)

2 out of 4, S31 WiFi Smart plugs failed to stay on after 3,weeks. Trying to contact seller for replacements.

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

The Android application itself it quite underdeveloped. It has basic features like a timer, usage graphing, and naming conventions, but lacks any sort of optimization.

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.

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+

Awesome way to monitor and check power off situation and power usage of our applications.

If you care about power monitoring function and/or potential to convert to Tasmota firmware, this is a serious candidate. Other than that, there may be better option around, e.g., TPLink HS103 (15A, no power monitoring) which is cheaper, has better software support and from a reputable manufacture (and UL listed). Now to get Tasmato firmware you need to have a USB-serial converter with 3.3v supply. You need to disassemble (and void warranty) the plug and solder 4 wire to connect to the serial, with the risk of destroying the soldering pad (I did on one of the VCC pad). All these are not really for average users. But if you went all the way through you got something really cool to play with.

Pros: Small footprint that would allow you to install two on a normal single gang outlet. Seem to be well-built, a step up from the no-name stuff of dubious origin and attention to electrical code/safety. EXTREMELY easy to disassemble and flash Tasmota/ESPHome if thats your thing. Integrates into Home Assistant easily, exposing Energy Consumption history, Wattage, Apparent Power, Reactive Power, Power Factor, Voltage, and Amperage. Cons: Ive ordered five units; (four S31 and one S31 Lite) over the last two months, and only one out of the five (the S31 Lite) showed an actual UL Listed badge. (My S31 circuit board design and components look identical to the UL Listed version pictures posted online, so Im not worried from a component/build quality standpoint, but a UL certification would bump this up to a 5-star product.) The form factor will block adjacent outlets if using on a normal power strip/surge protector/UPS. The mini 1-ft extension cords help for this use case

I chose these specifically for the history and current-usage software. And also because they allow up to 1800w of power - so I can use them to track space-heater usage! App works great and was super easy to set up. Plugs have an on/off button right on them, giving you manual control when you don’t have the app. Basically same price as comparable models, so worth it for the extra electricity capacity and the app’s UI!

These are great products to control devices and monitor power consumption remotely. I flash them with the Tasmota software package and then monitor/control them with Node Red. They appear to be certified to the equivalent of UL, though it would be great if they went with UL directly for the US market.