1) USB2.0 Version, compatible with USB1.1 2) 4 ports, and power up to 500mA each port 3) No need adapter, and no need driver program 4) Truly plug & play and hot swapping capability 5) Full data transfer rate up to 480Mbps 6) Support Win95 osR2/98SE/Me/2000/XP/Vista, Linux2.4andMac os8.5 or above