1. Delivers that warm, natural tube overdrive sound. 2. By rotating the knobs you can boost the guitar amp for colorful tone or overdrive itself for unique pedal sound. 3. True bypass hardware switching. 4. LED indicator shows the status of effect. Powered by AC adapter. 5. DRIVE overload knob: Adjust the distortion effect. Turn clockwise to increase distortion; turn counterclockwise to reduce distortion. 6. TONE Tone Knob: Control the amount of high frequency. Turn clockwise to make the sound more sharp; turn counterclockwise to reduce the amount of high frequencies, making the sound more gentle and rounded. 7. LEVEL volume knob: Control the volume of the effect. When the effect is working, you can use this knob to adjust the corresponding effect volume.