The plug works, the Android app, however...
Big trouble to install this plug, it is only possible via their Android (or iPhone) app "Tenda Beli", after creating an account with them.
When adding the device, the app crashed on my Samsung A5 2017. After many installs/reinstalls of the app, I tried with my wife's A3, it passed by activating the location... Once added, as it is linked to the account the plug appeared on my phone too.
Once configured, it works very well, even in 4G, despite the socket being behind a router + box...