For connecting up to 4 usb devices eg a usb memory stick an external hard drive to a usb 30 port great distance between sockets makes it easier to plug in wider usb plugsdongles bus powered ie power supply via the usb socket of a pcnotebook integrated usb cable for connection with a pcnotebook suitable and tested for usb 30 also works with usb 20 devices usb 30 is up to 10 times faster than usb 20 system requirements operating system windows 1087vistaxp as of sp3 and mac os as of 108