The st4300minu3b portable 4 port superspeed mini usb 30 hub black lets you expand your usb connectivity by turning a single usb 30 port into four external usb 30 ports the integrated cable design makes this mini usb hub the perfect accessory for your mac pc notebook or ultrabook computer the 4 port usb 30 hub supports usb 30 data bandwidth 5 gbps up to 10x more than usb 20 and is backward compatible with usb 20 and 11 devices ensuring flawless performance from all of your usb peripheralsd