Connector polarity: internal positive + (red line); external negative - (by black line); bus length: 29cm; transmission voltage: 1V-38V; Transmission current: maximum transmission 5A (12V); transmission power: maximum transmission power 60W; connector specifications: Outer diameter 5.5mm inner diameter 2.1mm; Wire material: full copper wire, low heat generation; Application of the connector: Power Line Head Transfer; GB standard interface size: outer diameter 5.5 mm inner diameter 2.1 mm, DC power extension cable