Hi-speed USB hub allows you to connect up 10 USB devices to a single USB port on your computer. Two hinged ports allow you to easily connect flash drives, MP3 players and more. While the hub will function perfectly in virtually all cases without needing an external power, a multi-voltage AC adapter (110/220V) is included in the event you are connecting power hungry devices. USB hub is backwards compatible so that it will function with both USB 2.0 and USB 1.1 devices. Overcurrent protection safeguards connected equipment from overvoltages. Hub is compatible with all major operating systems.