CASIO Casio Genuine AC Adapter AD-1J Center Minus INPUT: AC100-240V 50-60Hz OUTPUT: DC7.5V 400mA ● Connector: Round type, outer diameter approx. 5.5mm, inner diameter approx. 2.1mm The box shows signs of use, but the main unit is in clean condition. This was included with the CASIO SK-1. Power tested with a tester.