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PCB Mount 0.3A 16Vdc rated.
USB is a serial bus. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout).
For most of the kits on this site a usb socket can be used as a voltage input socket. So only the 5v and GND pins are connected.