Guitar Effects Power Adapter Feature: Positive-Sleeve, Negative-Center. Lightweight Design. Designed Specifically For Powering Multiple Effect Pedals, Suitable For A Variety Of 9V Voltage Stomp And Synthesizer Effects 9V Use. Fit For Many Pedals : Boss, Digitech, Dod, Dunlop, Electro-Harmonix, Caline,Kokko, Donner, Behringer, Ibanez, Zoom, Ebs, Guyatone, Biyang, Joyo, Mooer, Aroma ,Etc.