NS 2 Noise SuppressionBoss NS 2 Noise Suppressor 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 Input Impedance: 1 M ohms Output Impedance: 10 k ohms or greater Equivalent Input Noise Level: 110 dBu or less (IHF