The NS-2 Noise Suppressor eliminates unwanted noise and hum without altering an instrument"s natural tone. It"s the perfect pedal to quiet down any pedalboard or effects setup.*Compact noise suppression pedal for eliminating noise and hum in guitar and bass effects and amplifier setups*Unique noise detection circuit preserves the natural attack and envelope of an instrument"s sound*Threshold and Decay knobs allow for shaping the elimination/suppression as desired*BOSS 5-year warranty