Beware of the power required
I've withdrawn my previous comment as I'm not really happy with it any more.
The inverter works very well if you have equipment that consumes little connected to it.
Generally speaking, it runs well without any problems and in the event of a power cut, it takes over and beeps to warn you (I still haven't worked out how to stop the beeping that goes on for 30 minutes and it's really annoying).
But the problem I encountered was linked to the power of the device.
The specifications of the device indicate the power in watts, which I thought was for the "battery" mode. But no, it's for general use. As a result, I have a powerful PC and sometimes need a lot of power to carry out my tasks (video compilation, 3D, etc.), but apparently the device restricts this and keeps beeping to indicate a fault. It's very annoying and I don't really need it...
If you plug in something that doesn't consume much, it's fine, but if you plug in devices whose consumption fluctuates and may exceed the maximum power of the inverter, then it's not fine. Especially as the limiting power is indicated "offline" on the description.
I regret this purchase and not having had this information beforehand, hence this detailed review, in the hope that others won't be fooled.