USB Sharing Switch

I saw your video on youtube. In that video was written “switching USB display, keyboard ,mouse”, but I didn’t see any flesh card. I would like know does Plugable USB 2.0 sharing switch recognize flesh cards?. One more thing, I interested in scheme of plugable usb 2.0 sharing switch, is it controlled by relays or anything’s else. If it is possible, please send me the scheme or anything’s else because I find nothing about it.