The "Double Fat Boost" is a multi-tasking force to be reckoned with, it produces gain and sustain without colorization of your amp. The first boost delivers clean drive, while the second boost offers a darker tone added. Think of them as a double boost pedal your amp manufacture did not include when you purchased the amp. Now you'll have two additional variations to the sound you already love. Each section has a volume and Boost intensity knob which produces many variations. The Double Boost is a durable pedal and uses a 9-Volt Battery or AC adapter.