Donner Jet Convolution Flanger Classical Analog Rolling Guitar Effect Pedal 2 Modes Classical analog rolling effect, gentle and flat variation, special vibration rumbling noise effect Whole aluminium-alloy classic, stable and strong True bypass provide transparent tone, LED indicator shows the working state The filter mode is manual no automatic frequency sweep, sounds presented would be unique like the ringing bell Power supply: 9v AC adapter.(Not included) Power Supply9V DC (Negative in the center). Two Modals: Filter and Normal. Color KnobAdjust the depth of flanger. Ranger KnobControl the ranger of flanger. Rate KnobAdjust the changing speed of flanger. 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.