Custom built for Zakks loud, tough, and relentless riffs and leads, this will transform your amp into a heavy, chunky crunch machine. With a simple Output, Tone, and Gain control layout, setup is fast and easy. Zakk likes to stick it in front of a dirty amp and kick into full-on screaming lead tones with sustain that lasts for days. Hardwire bypass. Powered by 9 volt battery or AC adaptor (ECB003) - not included.