On Fri, 22 Sep 2017 20:21:41 +0200, Look165
wrote:

Generally, these devices are IR comunicating.
This needs an IR receiver on the PC.

Huh? IrDA has been essentially dead for at least 10 years. I haven't
seen a full size keyboard that uses IR for at least that long. Most
everything these days uses some form of wireless to communicate.

Well, not totally dead. It is still possible to buy an IR keyboard
today:
http://www.dsi-keyboards.com/product-category/keyboards/wireless-keyboards/ir-infrared-keyboards/


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