The VooDoo Labs power supplies have 9 and 12 volt outputs like many others. you also need to know what your total amperage draw is from all of your pedals and it is best to get more than what you need in case you add more pedals.
It also matters whether you want a rechargeable power source like the Volto pedal power and some of the Voodoo Lab power supplies, or a power source you will still need AC for. If you want complete independence, then look for the rechargeable power supplies. Strymon has a good variety but they are pricey.
If you know very little about the subject, I would call someone like Sweetwater and talk to a customer sales rep. You could also contact the manufacturer like Voodoo Labs or Strymon and they will be of help.
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