This is a Korg power adapter KA181. It's the unit only, without the box. Quoting from Soundhouse below: ■ Power Adapter ■ IN: AC100V～50/60Hz ■ OUT: DC9V/1.1A ■ Center negative, inner diameter 2.1mm ■ Compatible models: DC9V compatible effectors microKORG ※ Not compatible with microKORG S/XL/XL+. microKONTROL padKONTROL ELECTRIBE・SmkII K series (K25/K49/K61/K61P)