JOYO UZI distortion pedal, designed for heavy metal, it's characterized by High-Gain. with a "BIAS" knob, switch easily between American Distortion and British Distortion."GAIN" Knob and "VOLUME" Knob, both are of dynamic balance, adjust the "GAIN" knob while don't adjust the VOL, the signal from the circuit will adjust automatically, ensuring the volume is the same as before.Whole new appearance and the iconic ambience lights bring out futuristic and retro styles, displaying a perfect fusion, will make our soul happy whether are jamming in the bedroom, studio or on the stage.JOYO is over decade of brand reputation, provide worry-free after-sale service. with the most popular budget pedals, amplifiers, wireless systems, controllers, metronomes, tuners winning the love of global guitarists and inspiring people's music dreams.Before playing, please make sure the guitar is fully connected with the pedal. in order to make JOYO pedals work properly and avoiding unexpected noise, we recommend you to purchase an extra JOYO original power adapter, or choose the other reliable brands and make sure it meets the w