This is a great, versatile pedal with simple controls. One knob for Volume and one knob for Distortion. The two-way toggle switch in the middle chooses between high and low. The high setting gives you more low end, saturation and output. The low setting is a little grittier, with more of an overdrive feel to it.
This pedal can be powered either via a 9-volt battery or 9-volt adapter(battery/adapter not included).