The Bad Stain Twin Arrows Dual Overdrive Pedal helps shape your guitar tone, giving it an added punch. The Twin Arrows pedal can take a solid state amp and make it sound like a tube driven amp, and it will take a tube amp and give it an adde push. The Twin Arrows Pedal is actually a clone of two of the best overdrive pedals made. Flip the bullet shell switch in the up position and the pedal becomes an exact clone of the popular Hot Tubes Pedal from Electro-Harmonix. Flip the switch down and the pedal morphs into an exact replica of the popular Ibanez Tube Screamer that is consdered to be one of the greatest overdrive pedals ever made by hundreds of musicians. The Twin Arrows is compatible with any 9 volt DC power supply (Not Included). However, we recommend using a Bad Stain 9 volt power supply because we make money that way. If you’re not 100% satisfied with the BSNW Twin Arrows Pedal, I guess you’re out $160.