Latest 38pcs universal DC plugs power converterMatch with external laptop DC power battery or laptop universal AC power adapter to charge for your PC. DC plugs power converter, used for external power source and on-board transformer. 5.5*2.1mm Female baseEach connector tip can plug to a 5.5x2.1mm male connector, such as 5.5*2.1mm laptop power bank, 5.5*2.1mm AC adapter.