Mooer Audio micro effect pedals pack an incredibility BIG sound into a very small package. Our Green Mile is based on the legendary "Tube Screamer" sound. Two modes give the flexibility to switch between a warm tube drive sound with the natural dynamic response of a classic tube amp and a hot mode that gives more power and crunch. The Green Mile uses the classic JRC4558 chip. All Mooer pedals have a 1 year warranty.