Andoer SHO Booster Electric Guitar Effect Pedal Mini Single Effect with Clean Boost True Bypass Full metal shell, exquisite and big sound. Single knob control to adjust the degree of booster. With one single knob to accomplish everything, easy-to-use! The light flashing when working. True bypass switching in order to protect signal integrity when the pedal is not engaged. Foot-switch toggle controlling on/off condition. A electric guitar effect pedal offers excellent, stable buffering and a fantastic clean boost.