1. Classic distortion tone. 2. 2-stage distortion design provides higher degree of distortion. 3. Powered by AC adapter (not included). 4. High quality by aluminum alloy which is durable and have a classic mini size brings you a musical feast. 5. LED indicator shows the status of effect. 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. GAIN gain adjustment knob: Adjust the degree of distortion effect. Turn clockwise to increase the sound distortion and maintain the guitar's pitch, counterclockwise to reduce the amount of sound distortion. 8. 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.