Passive
Passive effects pedals (often volume pedals, switchers etc.) can be used without a power supply (and if they got one it is often only to power a status LED).
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Fender FVP-1 Volume Pedal
Check it at Reverb -
Valeton Surge EP-2 Mini
Check it at Thomann -
Sonicake Vexpress
Check it at Amazon
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