Specification:
 It pides into USB 1.1 and USB 2.0.
USB HUB1.1:
Adds 4 USB 1.1Hi-Speed ports
USB HUB2.0 :
Adds 4 USB 2.0 Hi-Speed ports
Fully Compliant with USB 2.0 Specification  Supports up to 127 Hi-Speed devices
Backwards Compatible with USB 1.1
Support data transfer rate at 1.5/12/480Mbps  Inpidual Port Over-Current Portection
Friendly & ergonomic design, easily potable  Provide up to 500mA per port sufficient for perse devices
Power Adapter included
Plug & play installation  
Support Window98,windows2000,windows ME,windows xp  
Support Mac OS 8.6 or above  
Hi-Speed Down stream ports with USB A Female connectors
Hi-Speed Up stream ports with Mini USB 5P Jack