Kayorock
Kayorock
It has the USB dongle but it also works via bluetooth on my cell phone and on the pc too, it's the ipega 9076 so different from the common one...
here some pictures of him.   
Yes, I tried to stop in bluetooth mode too but unfortunately it doesn't connect, when I was on firmware 15.0.1 it didn't work either, I updated it to firmware 16.0.0...
One detail that I noticed when I connected it to my cell phone is that its name here is pg 9156 and not 9076, I don't know if that interferes...
On the pc also appears pg 9156 when I connect via bluetooth, should I try to install or update to version pg 9076?
I did the step by step and I got there. 
OK, I'll be looking forward to playing with this controller on my Switch :)