Balance your guitar's sound and vary its tone to suit different song-styles with the Boss EQ-20 Equalizer Guitar Effect Pedal. This EQ-20 Equalizer is the world's first programmable 10-band graphic digital equalizer pedal for electric and bass guitars. This Guitar Effect Pedal has a simple interface and it plays continuously for 12 hours on one set of AA batteries. The Boss EQ-20 Equalizer Guitar Effect Pedal uses superb A/D-D/A converters that ensure a professional sound quality. . This EQ-20 Equalizer lets you shape your sound with 9 presets and a manual on the pedal. The preset feature in the Boss EQ-20 Equalizer Guitar Effect Pedal lets you switch EQs seamlessly, in the middle of a song. This Guitar Effect Pedal has a LED Display to tell the position of each slider.