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ExpressCards offer a quick and easy way to add whatever interface your peripheral device needs to your computer, without the hassle of opening your computer for installation. Be sure to make sure that the ExpressCard you're looking at will work with your computer's ExpressCard slot. This ExpressCard allows you to quickly add two USB 3.0 port to your computer. USB 3.0 is the newest and fastest data transfer interface that is currently available on the market.