You need to find one that says "CH" and not "DE". I got the DE because it was cheap and you can always just change the language on Windows (as long as you're someone who can type without looking at the keyboard). There's a reason why this keyboard has existed for over a decade, even before the Logitech Unifying receiver.

The Logi K350 is exactly what you need, I am very satisfied with it.

so this keyboard Logitech K350, wireless, has Ö,Ä é etc and NO double S
I am totally happy with this keyboard

I had to return this keyboard because it has a German layout. Not a Swiss keyboard.

Logitech Ergo K860 (CH, Kabellos)
k860 gibt es swiss german

Hello, unfortunately I can't help you. I don't have a double S on my keyboard. I think the keyboard is crap. A few keys don't type the characters that are displayed.