Most laptops dont come with enough usb ports this 3 port usb 30 hub adds three additional usb interfaces to your laptop or pc whether its usb mouse flash memory usb drive or external hard drive plenty of ports available whenevere you need them the slimline design makes sure it doesnt get in the way means its the perfect upgrade for your officeadditional memory card readerthe hub also features a built in memory card reader allows you to access data stored on sd and micro sd cards