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Anyone who's played vintage analog effects (especially fuzz and wah) knows the tone will change depending on the strength of the 9 volt battery inside. This effect allows you to adjust the voltage supplied to your pedal and thus, alter the tone. Simply insert the "Dead Bat" in the chain between your power supply and the pedal. Adjust the knob to deliver a full 9 volts of power down to about 6 volts when turned all the way down. This is a very versatile tool which takes up very little pedal board space. Each "Dead Bat" is hand wired in the U.S. using quality circuit components.