Korg Monotron Duo, Analog Ribbon Synthesizer, two analogue VCO´s, Cross-Modulation circuit, from the Korg Mono/Poly, original Analog Filter thomann circuit from the MS-10/MS-20, Ribbon controller, aux input (stereo mini-jack), headphone output (stereo mini-jack). Power supply: 2x AAA alkaline. Dimensions: 120 x 72 x 28mm.