The Targus 4-Port Hub is a convenient and compact way to use more USB ports than your computer has available. The hub is USB powered so there is no need to always plug into an AC adapter, giving you the ability to connect up to four electronic devices to your laptop all at once. Charge your phone or MP3 player and access your external hard drive from one hub. The compact design makes it easy to take it along with you anywhere you go. Designed to work with PC, Mac and Netbook computers