USBDUALCDC

This is a dual USB ports device which based on WCH CH32V208. And both of these 2 USB ports are acted as USB CDC. In this way,

you can transfer data by USB COM between 2 PCs.

For more information, you can find it in:

https://mc.dfrobot.com.cn/forum.php?mod=viewthread&tid=315504#pid537648

And here is the video

https://www.bilibili.com/video/BV1484y1H7UM/