The DC Converter adapter allows you to convert a DC jack plug that is 5.5 mm x 2.1 mm to 3.5 mm Jack Plug. Most commonly used with CCTV equipment but can also be used with low powered devices such as LED lights & Solar powered Water pumps Audio Video Players Notebooks etcNickel plated DC adapter provide stable power delivery. 360 degree grip treads helps easy to plug and unplug your device. Please ensure you are aware of the DC jack required before ordering as there are various sizes. If you are unsure then please check with your manufacturer.