18V Power supply AC DC Adapter for effects pedals that require a 18v (-) negative center polarity and 300mA draw or less. Check with manufacturer to see if your pedal is compatible. 18V Negative Center Polarity Input 100-240V UL Listed Designed for quiet operation Works with pedals compatible with 18V ( - ) center polarity. Here are some examples of pedals that can use an 18V (-) power supply: Danelectro Cool Cat DC-1 Chorus Pedal, Fulltone OCD, Seymour Duncan Vapor Trail, Cali76 Compact Deluxe, Timmy, EQD Depths, Wampler Belle Transparent Overdrive, Catalin Sabbra Cadabra, Catalinbread Topanga and Topanga Burnside, and many more. Do not use with pedals that are not compatible with 18 volts. *This listing is for the power supply only photos of pedals are for illustrative purposes only.