ANiceS Replacement AC Adapter for Boss Dr. Rhythm DR-3 DR-5 DR-550/550 MKII-MK2 Power Supply 100% Brand New and High Quality Input Voltage : AC 100-240V (Worldwide AC Input) / Input Frequency : 50-60Hz / Output : 9V 1A Max / Tip : Center(-)Outer(+) Note: Please make sure the DC output and tip size of ac adapter are accordant before you buy. Industry Quality : Over Voltage Protection, Over Heat Protection, CE Free & Fast shipping