I have connected the device via HDMI to a 4K TV and it works for transmission with the notebook in the meeting room - however, I don't think the device transmits 4K resolution. Probably 1080p at most according to the manufacturer's site.

Rather not, there is no information about this on the manufacturer's site. We do not use the part, as it was not available for a very long time, the order was cancelled.

I only have the device on a Full HD projector, so I can't say anything about 4K.