The BOSS MD-500 can be powered by the following options.
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AC Adaptor: The BOSS PSA Series (sold separately) is recommended.
The MD-500 has a current draw of 225 mA and requires the PSA-S or PSA-S2 (output: 500 mA). PSA Series adaptors are available in regional variants with different plug shapes. Select the model appropriate for your region. Using an AC adaptor from another manufacturer may cause malfunction. - Batteries: Alkaline batteries (AA, LR6) x 4