Yellow guitar effects pedal with versatile tone adjustments. A legendary overdrive. This is a unit from the hand-written serial number era, but the serial number itself has faded and is difficult to read clearly. - Model: AC Booster - Brand: xotic effects - Color: Yellow - Controls: Gain, Volume, Treble, Bass - Power: 9V DC Thank you for viewing. Functionality has been confirmed. Selling due to a switch to a multi-effects unit.