Features  Compliant with Universal Serial Bus Specification Revision 2.0 (Data Rate 1.5/12/480 Mbps)  Connects up to 127 USB Devices  Bus-power and self-power mode used  Plug-and-play function  1 upstream and 4 downstream USB ports included  Over-current detection and protection  1 red LED as power-on indicator (In some models, there is a green LED indicator for each downstream port apart from the red LED.) System Requirements  Desktop or notebook computer with USB port  One of the following operating systems (no driver needed): Win 98SE/Win ME/Win 2000/Win XP & Mac 10.1 up