There is an adapter that you plug into the German plug, which then welds itself to the plug.
The plug then fits into a CH socket, but the plug then becomes a bit bulky.

The answers are not translated into French and are only displayed in German, which unfortunately I don't speak. So the product doesn't have a Swiss plug but it will be delivered with an extra adapter? For me that makes all the difference because I have a multi-socket and with an adapter it won't fit any more, I need a Swiss plug, very thin, with 3 pins.

Yes, an additional adapter for Switzerland was included.