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3.5mm Converter For Guitar PedalsFeatures:high quality.Convert 5.5mmx2.1/2.5mm to 3.5mm(1/8″)To power Electro-Harmonix, older DOD, and other pedals that require a positive tip 3.5mm (1/8″) plug.Works with 9V 5.5mmx2.1/2.5mm negative center power supply, such as BOSS PSA Power sup..