This is a BOSS OD-1 clone pedal. It not only replicates the sound of the vintage OD-1 but also offers a wide range of applications thanks to various switches. Fat Switch: When the switch is OFF, the circuit is equivalent to the original. Bright Control: Turning the control knob to the right opens up the high frequencies. When the control knob is turned fully to the left, the circuit is equivalent to the original. Boost Switch: Boosts the output without changing the sound quality. When the switch is OFF, the circuit is equivalent to the original.