Everything works perfectly without any issues. It's a fantastic unit. The Electro-Harmonix BIG MUFF is a guitar effects pedal with three controls: Volume, Tone, and Sustain. - Model Name: BIG MUFF - Brand Name: electro-harmonix - Control Knobs: Volume, Tone, Sustain - Input Terminals: Input, Tone Bypass - Power: AC adapter, Battery - Made in: USA Thank you for viewing. Please be sure to read the profile and agree to the terms before making a purchase. Electro Harmonix Big Muff / Big Muff / Body Only / Tone Bypass