I received the Shadowcast from Genki, the size of a card reader, and the accessory is a C-C USB 2.0 data cable.
When using it, you need to use C-C to connect the computer and the Shadowcast, and then plug it into the base of the Switch. Then open the supporting software Genki Arcade. The actual experience is very good.
It’s also suitable for other game consoles and cameras. This thing has the function of a capture card, which can record, take screenshots, and can also be used for game live broadcasts.
It’s suitable for those who don’t have a purchased screen and want to use the laptop screen to play games.
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Sean Lee 
Mike Lee-111 
Jason