ArmorView&reg; 10 Pack DC Male (10) DC Female 2.1x5.5mm Power Plug Pigtails CCTV Cameras Power leads are typically used to connect plug and play security camera cables to a DC power supply box. Also referred to as 12V DC Power Leads, The diameter of the connector is 5.5x2.1mm which is the standard size used for plug and play cables. Pigtail used when extending a security cameras power supply cabling. Provides a positive (white) and negative (black) power lead for easy extension of power cables. Used to connect a twisted 18awg two conductor power wire to a plug-in power supply for security cameras.