there's 4 wires in usb, red(+votalge/power), black(ground), white and green (both data). The xbox has another yellow wire for the rumble pad I think. I hook up all those wires from the receiver EXCEPT the red to all of the same wires on all 4 ports. Depending which red wire I do connect on which port, that port will have the receiver connected to it. The rest will work as normal xbox controller ports (really just usb). If I apply the red lead to the receiver on a port, then the receiver is hooked up, but the port becomes unusable as a regular controller port till I switch the receiver to another port or turn it off altogether(which is another ability I would like to have).