Product Features: 5.5mm X 2.1mm DC plug extension cable allows flexible option for setting up electronic device such as CCTV camera, printers, LED lamps and signage, sensors, anything that requires DC input and accept 5.5mm x 2.1mm plug, where wall outlet may be out of reach. Comes with female jack at one and a male plug on the other to extend the reach of DC power supply. This unit only accepts 5.5mm x 2.1mm barrel plug from power adapter and will not work with other sizes. Note: The surest way to determine if this cable is compatible with your power adapter is by measuring the inner diameter and outer diameter of the plug of the power adapter. Package Includes: 2x3m DC extension cable