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)

These are great plugs that provide a great deal of power usage info, are easily flashed to Tasmota (for local home automation), and are well manufactured. Have at least 8 in the house now, purchased over many years, and they keep working great.

I have one I use in conjuction with a motion detector to turn a light on when I enter my bedroom and it works flawlessly. As at the time I did not have a zigbee gateway, I bought the wiwfi version. I have no complaints at all.

Update: It appears that I have spoken too soon. Out of the 6 total units that I have now, 2 of them will not power on or pair (I am 7 days in the dark with their customer service with this so far) and 3 of them randomly read as Unavailable. Looks like Ill be sticking with Wyze outlets for the future. Disclaimer: I ordered these to run on my Home Assistant (HA); I have not tried using them with any other system or integration. This review is for the S40 Wifi Plugs. TLDR; I liked the 2 pack of S40 plugs enough to buy another 4 pack and also suggest them to my brother. For anyone running Home Assistant, the setup isnt that horrible, but you are going to have to use the eWeLink app for the initial setup to your network. Additionally, you can get them to be on a local LAN (and not on the cloud) but it will involve some Googling, reading, and some work to get it done. The initial (app) setup was smooth and getting things to work on HA only took a couple of more minutes after doing a little Googling. The energy monitoring seems to be fairly accurate in the sense that a 60-watt LED light was reading approximately 58 watts in HA, but I wasnt proactive enough to verify with the Fluke or Kill-A-Watt yet. (Ill do that and update this review at a later date) At this juncture, Im more concerned about reading energy draw vs no energy draw in order to act as a trigger instead of monitoring energy usage (I monitor consumption at the breaker panel, so I dont really need to do it at the component level yet). The only drawback that I have encountered thus far; if you wish to remove a plug from one network and use it with another, you MUST first go into the eWeLink app and remove it while it is still in the original network before trying to move it to another location (with a different network). In my experience, if you do not perform this step first (and attempt to remove it from the app when the plug is at a different location), the plug WILL NOT turn on nor will you be able to re-enter pairing mode. Im not sure why it was acting like this, but when I returned it to the original wifi network, I was able to get it working without any problems. My original experience with Sonoff was with an S40 Lite Zigbee model and it frustrated me to the point of wanting to chuck it out the window and steered clear of their products for a good while. Thankfully, these (S40 wifi variant) was much easier to play with and my gamble paid off; resulting in me ordering a 4 pack to use within my HA ecosystem as well.

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

After thunderstorm power outage, the products turns off on its own and doesn’t turn back on. Scheduling on the app doesn’t quite work all the time.hopefully Alexa can take over this. Wouldn’t recommend to put on always need to tbe on device.

Wifi loose connection all the time, device became useless,

The are really good in terms of price/functionality. it can read how much KWp you are using when plugged. Its really easy to pair and setup, just need the ewelink app, Good alexa / google integration. works every time

The power adaptor is WiFi based, and I still havent connected to hassio yet. I tried to reset the device into local API mode, but still no luck yet. The android app is clunky and requires a cloud login. I run hassio cloudless. After much frustration with DIY mode, I tried flashing it with tasmota. Soldering the wires was a bit delicate - I suggest using headers instead. Then I learned that some FTDI and other serial tools have 5v power with 3.3v logic. After I finally got a fully 3.3v setup, the board appears dead. It just emits zeros. Even if it works, it then needs calibration. Sonoff ZigBee devices, in comparison are flawless and just work. I think Im done with Sonoff Wifi devices for now. I already have one power meter that I made from a raspi and an inductive current sensor. Power measurement isnt that hard. That cost a little more, but I wasnt fighting a black box, I was building with fully specd components. This might work flawlessly for some people. Maybe I just have a broken unit. Still, nowhere near as simple as their zigbee devices.

I do like this device especially since its so much cheaper than other devices similar to it. But you do pay for that in some ways because it doesnt have a fast rate of updating. So it seems to freeze occasionally for 10 to 15 seconds and then other times it will report every 5 or so seconds. For my purposes it does just what I needed to.

Easy to setup and easy to use.