Diameter of connector: 2.1mm x 5.5mm, power extension cord is made from plastic and copper. It supports DC 5-24V power adapter. | It can be used as an extension cord between your wireless camera and power supply adapter for CCTV surveillance wireless camera kit, LED stripes, etc. | It will solve your problem when you find that your power supply cable is not long enough. | For DC power - Recommended up to 24 volts, max load 2amp or less. For any applications that require DC input and accept 2.1mm x 5.5mm plug (Does not work with other sizes). | Offers you a 1-Year warranty and Lifetime technical support.