Adds 4 USB 2.0Hi-Speed port Fully compliant with USB 2.0 Specification Backwards Compatible with USB 1.1 Support data transfer rate at 1.5/12/480 Mbps Individual Port Over-Current Protection Provide up to 500mA per port sufficient for diverse devices Power Adapter included (5V/2.6Aoutput) Plug & play installation Driver less, hot plug & play, Blue LED show Support Windows 98,2000,ME,XP, Linux 2.4 and Mac OS8.5 or above version Allows matching outside power of DC5V/1000mA