1. Adds 4 USB 2.0 Hi-Speed port 2. fully compliant with USB 2.0 Specification 3. Backwards Compatible with USB 1.1 4. Support date transfer rate at 1.5/12/480Mbps 5. Individual Port Over-Vurent Protection 6. Provide up to 500mA per port sufficient for diverse devices 7. Power Adapter included (5V/2.6A Output) 8. Plug & play installation 9. Driver less, hot plug & play,Blue LED show 10. Support Window 98.2000.ME..XP Linux2.4 and Mac OS8.5 or above version 11. Allows matching outside power of DC 5V/1000mA