This is a ZVEX distortion pedal for sale. It's an effects pedal designed to emulate the sound of a fully cranked Marshall JTM45, a legendary amplifier. It's considered a sibling to the ZVEX Box of Rock, with a slightly tighter low-end and a toggle switch to control the amount of bass, making it an easy-to-use pedal. Fully functional. Velcro is attached to the back. Please consider.