How do the Usb-C to Display Adapters work?

There are no details on the product page (https://shop.allnetchina.cn/collections/usb-c-corner/products/usb-c-to-display-adapter) do these require setting up or are they plug and play? Do they present themselves to windows as a 2nd video card?

Just plug it into USB-C port on a windows pc and into an old CRT VGA monitor and it will just work?

This is not our product, I suggest you check with Allnet.