*work with Hi-Speed(480Mbps); *Full-speed(12Mbps)and low-speed(1.5Mbps)data transfer rates; *Compliant with USB 1.1/2.0 *Can work normally by bus-power, or with external power adapter; *data access LED; *Over-current detection and protection for each down-stream port adopt the most advanced protection Polyswitech, prevent damage from error operations of the device; *Expand one USB port to seven ports; *Provide up to 500mA current to each port which is sufficient for diverse devices; *Power Adapter included (DC5V/1.5A Output; *Support EHCI&UHCI&OHCI Specification; *Silver Aluminium housing; *Support Windows 98/98SE/Me/2000/XP; Linux2.4 or above; Mac OS X10.1 or above;