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 bass. 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. Power Supply: DC 9V AC adapter Input: 1/4 inch monaural Jack Output: 1/4 inch monaural Jack Item Weight: 147g / 5.2oz colour:black Material:metal size:9.3 * 3.8 * 3.2cm