The Belkin Pocket Hub allows you to instantly connect USB devices such as printers, scanners, external mice and keyboards, joysticks, digital cameras, or other USB hubs - without having to restart your computer. It is the perfect companion for laptop or iBook users in the office, at home or on the road. You can even match the color of your notebook by swapping the sleeves. Just connect the Pocket Hub to your laptop or iBook, attach your devices to the hub and that's it!The USB port on the computer allows most USB devices to be powered through the hub. Some devices, however, such as scanners and modems, require that the hub connected, be powered. For devices requiring additional power, an optional AC adapter is included in this package.