VideoSecu PC50 DC power pigtail extension cable can be used for CCTV security camera, DVRs and anything require power adapter with 2.1mm x 5.5mm plug. Notice: The definition of female and male are different, please refer to picture for actual item sold here. Make sure that the power adapter can supply enough power over the extension cable. From 20ft and up the resistance and the drop off in power may become noticeable.