DC jack plug size: 5.5mm x 2.1mm. These cables are only suitable for devices with 5.5mm x 2.1mm DC jack plugs. NOT suitable for devices with 3.5mm x 1.35mm or other DC jack plugs. | Suitable for devices with 5.5mm x 2.1mm DC plug. For example, CCTV cameras, car monitors, LED strips, etc. | Working voltage: DC 5V-24V; Working current: 3A max. | Flexible and durable: The tinned pure copper wires stranded inside, so it can take a lot of bending without breaking. Pure copper wires electroplated with tin can prevent oxidation, which ensures flexibility, durability, good electrical conductivity and a longer service life. | Plug and play. Easy installation and reliable connection.