1: One upstream USB port, four downstream USB ports; 2: LED梚ndicator to check Up-link and down-port communication; 3: Self-powered mode emulation, no extra power-source needed; 4: Supporting full-speed (12MB/ps) and low-speed (1.5MB/ps); 5: Cool beside blue light; 6: Works with WIN98/2000/2003/XP/ME/MAC