Guitar distortion fuzz effect pedal based on electro-harmonix Big Muff Pi.SUSTAIN knob adjusts the amount of sustain and distortion; VOLUME knob sets the output level.TONE knob provides a range of sounds from high treble to deep .True bypass footswitch for switching between overdrive effect and bypass status.LED light for indicating effects or bypass status. Full metal shell and compact size, durable and portable. Supply: DC 9V AC adapter Input: 1/4 inch monaural JackOutput: 1/4 inch monaural JackItem Weight: 147g / 52ozcolour:blackMaterial:metalsize:93 * 38 * 32cmPackage Contents:1 * Effect PedalOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.