SONOFF is easy to install because all you have to do is cut the power line of the ceiling fan and connect it in the middle. There was one, so I called a local electrician to install it.
At this point, the electrician didn't seem to know what this device does, but the SONOFF I bought in Vietnam came with a Vietnamese installation manual, so I had no problem wiring it. I was able to.
The size is also small, about 5cm x 3cm, so it is not too big to be attached to the wall. I was able to install SONOFF on all ceiling fans in about 30 minutes.
eWelink app settings
To control SONOFF, you need an iPhone or Android smartphone and a dedicated app called eWelink. After downloading the iOS version, the first thing to do is create an eWelink account. Accounts are created on Chinese servers and all eWelink operations go through the Chinese servers.
In other words, the moment you click the power button while sitting on the sofa in the room, the data is transmitted to the server in China via the Internet, and the server in China turns the power switch of the ceiling fan on and off.
Convenience is certainly convenient, but it is a prerequisite for operation that the Internet line is always alive. Even if there is no power outage in the room, if the internet line is dead, you can't even turn it on.
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