Features: 1) Shell color: Clear Blue, White, green, Purple, Red, Yellow. 2) USB 1.0/1.1/2.0 3) 4 Independent USB ports without external power. 4) Each port supply up to 500MA in maximum. 5) High-speed transfer rate at 12Mbps; Low-speed transfer rate at 1.5Mbps for 1.0/1.1 version; High-speed tranfer rate at 480Mbps for 2.0 version. 6) Supporting system: WIN95/98/2000/XP, LINUX,MAC