DLS Effects RotoSPIN Rotary Speaker Effect Size: Extremely compact and measures only 3.7W x 4.7L x 1.7H Power +9vdc: Input for 9 to 12vdc, 90ma minimum, 2.1mm jack, polarity does not matter. (DC adapter included) Case material: Quality die cast aluminum finished with power coat painting for durable finish. Internal Pot adjustments: INA gain pot, OUTA & OUTB volume Input/Outs:  jacks, Mono: INA to either OUTA or OUTB (bright), Stereo: INA to both OUTA and OUTB