The hard-wire kit converts the 12V of the car's electrical system into the 5V required for USB. It has bare wires at one end, and a mini-USB jack at the other. Between these two, there'll be a DC-DC converter, and usually an inline fuse also.
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The hard-wire kit converts the 12V of the car's electrical system into the 5V required for USB. It has bare wires at one end, and a mini-USB jack at the other. Between these two, there'll be a DC-DC converter, and usually an inline fuse also.