1. USB 4-ports Hub: 1.1/2.0 version 2. USB hub powered an noexternal adapter is required . 3. Plug-and-Play, Driver is not required. 4. Support Window98/2000/XP/Window 7 5. Wide used for external storage devices, Scanners, Printers, DVD Drivers, CD-RM drivers, Digital Cameras/Camcorder 6. DC power supply 5V (DC adapter not included)