Connector material: copper coreElectroplating process: nickel platingPlug life: 1000-1200 times3C rated voltage range: below 50VNotebook power plug DC adapter 5.5*2.1 female to 3.5*1.35Female head: outer diameter 5.5mm inner cylinder diameter 2.1mmMale head: 3.5mm outer diameter, 1.35mm inner diameter, suitable for converting the power supply (charger) of the 5.5*2.1 interface into a power connector of 3.5*1.35, so as to charge the notebook, etc.Package Includes: 2PCS