JOYO Overdrive Effect Pedal Dual Channel with Independent Footswitch for Electric Guitar - JDC Signature (TORNADO R-21)Dual channels: Overdrive and boost, while setting 5 independent high precision tone control knobs, switch flexibly from clean, rich overdrive tones to wild overtones Signed and certified by Jos de Castro, a Grammy Award winner, this signature pedal was discussed and optimally modulated many times Metal alloy case, mini and solid, while setting 5 independent high precision tone control knobs JOYO 9V DC pedal power supply ( NOT included) can be used,