Boss PSA-120S Power Supply 9v 500mA Power any BOSS effect pedal, including those with digital circuitry. Converts AC wall current to 9 volts DC current. Power supply designed to operate a multitude of BOSS and Roland products. Regulated with a higher milliamp rating for use with digital equipment. Output: DC9V (regulated), 500mA Tip negative, sleeve positive 3-meter cable Status light that flashes if there are grounding problems Small footprint (similar to a cell phone charger)