Tool-free chassis of the USB, how different it?

USB serial that all along the 9-pin.And then plug the USB connector can only
a series together.
On board are two USB1 USB2, you only need to take a,?
Then The two front-panel USB port of …
is not the face of better tools to play ah?

did not understand what you mean usb needs of each 4 green and red and white lines
…..? useless
….
green and red and white

Then the whole hand