This USB switch box enables you to share up to four USB devices between two computers. At the touch of a button, connect either computer to a keyboard, mouse, portable hard drive, scanner, printer, or any other usb accessory. This saves you the added expense of additional USB peripherals, and helps de-clutter your desk at the same time. It is USB 3.0 compliant, supports speeds up to 5Gbps, works on most operating systems, and is backwards compatible with USB 2.0 and USB 1.1 devices. It is plug-and-play, so no drivers are needed, and it can operate without any external power, however, a micro USB port is provided for optional power should you need it (power supply not included).