This design gives you two ultrafast USB hubs in one: a stable base and a travel hub. The 3-port base can connect your larger more stationary equipment, such as printers and hard drives. The detachable, 4-port travel hub offers a great connection point for your mouse, MP3 player, camera, and fl ash drives. It"s easy to take on the road, and simply plugs into a USB port on your laptop when you need it. Its rotating connector keeps adjacent ports free.