USB to DC 3.5 1.35mm 2.0 0.6mm 2.5 0.7mm 4.0 1.7mm 5.5 2.1mm 5.5 2.5mm Plug Jack DC 5V Power Extension Cable Connector. Provides 5V DC from USB. Connector A: USB 2.0 A Male. The 5521 model was originally a circular plug, but has now been upgraded to a tuning fork plug.
