Switch Cables,2 computers (laptops) share one device (printer, copier, U disk, etc.), no need to plug in and out, only one can work through the button switch, note: can not be used at the same time. Both ports can be charged and data synchronized, and a printing line is included Works with USB 2.0, or 1.1 host controllers and devices on Windows, Mac, and Linux/Unix computers at USB 2.0 speeds. The principle is Simple, a simple switch for one device (for example a keyboardor printer) and switch it between two computers. Simply plug it in and it works.