DC Jack, also known as a power jack, DC power jack, male jack, male plug, etc, is used to give external DC power to any device or board. It has a cylindrical miniature size. It is a perfect option to give direct external power to the board or any device. If you need to connect a DC power wall wart to a board that doesn’t have a DC jack – this adapter will come in very handy! There is a 2.1mm DC jack on one end, and two normal terminal wires on the other. The red wire is positive and the black/white wire is negative. This product is known as CCTV Devices DC 5.5×2.1mm Female 2-Wire Lead Jack Power Cable Connector, 5.5X2.1mm 12V DC Power Plug Female Jack Plug Cable, 5.5mm x 2.1mm DC Jack Connectors Power Extension Cable.
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