Donner Tutti Love Chorus Guitar Effect Pedal Pure Analog True Bypass Pure analog chorus effect, clear, gentle, plump Whole aluminum alloy classic, stable and strong True bypass provide transparent tone LED indicator shows the working state Power supply: 9V AC adapter (not power adapter included) Power Supply9V DC (Negative in the center). Two Modals: Normal and Treble. Level KnobControl the sound volume with effect. Tone KnobControl the tone of sound. Comp KnobAdjust the intensity of compression. 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.