Extra Long And Premium Durable Design:6.56FT power extension cable is high precision low impedance line,10000+ bend lifespan,make power cables more durable and tangle. Female and Male plug size:Outer diameter 5.5mm x inner diameter 2.1mm plug ,Male to Female connectors. Suitable Device:This power extension cable only available for power supplies and equipment with connector size of 5.5x2.1mm. Suitable for Camera, LED lights, printers, routers, cars, sensors and so on (Don't work with other size). NOTED - Please make sure the Connector size are identical to what your need before buying.