Donner Guitar Stylish Fuzz Traditional Rich,Aluminium-alloy Classic Effects Pedal Traditional fuzz effect, plump and rich Whole Aluminium alloy classic, stable and strong True bypass provide transparent tone LED indicator shows the working state.Notice:Not power adapter included Power Supply9V DC (Negative in the center). Volume KnobControl the sound volume with Fuzz effect. Tone KnobAdjust the depth of Fuzz tone. Bustain KnobAdjust the degree of Fuzz sound. Input &amp; Output JackAnalogy though 1/4 mono audio jack. LED LightLED indicator shows the working state. Full metal shellAluminum-alloy classic, stable and strong. True BypassTrue bypass for zero tone coloration.