Replacement (aftermarket) AC Power Adapter for the following Boss Pedals: OverDrive OD-1, Overdrive OD-3 & Super OverDrive SD-1. These power supplies use a center negative pin as required by these products. Do not use positive center pin power supplies with these units! It will damage them. Specifications: I/P AC:100V~240VAC 50-60Hz O/P DC:9V DC 1A Chord: 43in Tip: (-)center, (+)outer