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The 21-pin connector plugs directly into your charging port for fast syncing and charging. In order to maximize the efficiency of data transmission of Smartphones and PC's that support a USB 3.0 interface, you just use the USB Data Cable. There are two ways of charging your Smartphone with the USB 3.0 Data Cable. One is using a desktop PC/laptop, and the other one is using a Samsung wall charger (comes with most Samsung handsets/tablets, also sold separately) or car charger head unit (car chargers sold separately).