Sorry: been a while since i logged in here.
As far as I can see, externally it just has a built in line display on the front of the box which gives some status display and ‘fancy’ multi-color light on top.
Wifi 6 and BT 5.0 reported but I am not using.
Pics of the board being added.
@fensoft , I have built 2 boxes with the chipset RK3528 with your image. In the 1st box audio is working fine without any issue, in the 2nd box it was working earlier but stopped working. Is there any driver or setting that I have to restart or modify to make it working?