Bill,
Hellish clever those Germans sound out a KB with no cables, the first wireless output KB ever, save you tripping over cables.
Well, Tony, at least the Wersi is actually plugged in(power cord)in this video...the last one had nary a wire coming from it.
I think

the Wing's on-board
photon generator transmits the audio...amazing!

Merry Christmas to all!

Ian
PS...Seriously, Bill, this is a nice performance. Thanks