1) Plug-and-play installation 2) User-friendly and ergonomic design 3) Supports Windows 98, 98SE, 2000, ME, XP, Mac OS 9.x, 10.x 4) Over-current detection and protection 5) Fully compliant with USB 2.0 specifications, backwardly compatible with USB 1.1 6) Supports up to 127 hi-speed devices 7) Supports data transfer rate at 1.5/12/480Mbps 8) Adds 4 USB 2.0 hi-speed ports