CHOPPER-Z is a high gain amp simulation pedal brings you modern metal sound. It features 412 cabinet modulation and noise gate, copatible for PA system and guitar amps.R-18 CHO DPPER-Z High Gain Amp Simulation FlITS FOR MULTIPLE OUTPUT MODES A high gain amp simulation pedal brings you modern metal sound. It features 412 cabinet modulation, 3 different output modes and noise gate, perfect practice, band rehearsal connecting to amps, or performance connecting to PA system, as you can adjust the Output modes any time. Fits for both guitarists and beginners.PRE AMP: R-18 becomes a Distortion pedal when it connects to guitar amp's Input mode. AMP: R-18 becomes a preamp pedal when it connects to amp mode. You need to it to guitar amp's Return and make the pedal as amp's preamp. This connection brings out the sound of the pedal, without tone coloration.CAB SIM: For connecting to the full-range amps, such as PA system with -range playback capability, if it's in use when not connected to the guitar amp, this mode simulates the tone of pedals connected with amps, convenient for performance or recording. In CAB SIM mode, you can adjust the high frequency response by turning CAB SIM.Cabinet modulations: adjusting the cab modulation signalsNoise gate: attenuating signals register below the Dimensions: 130 x 110 x 50mmOutput Impedance: 2KWeight: 403gWorking Current: Greater than 120mAInput Impedance: 1MWorking Voltage: DC 9V (center ) Number: -18Type: EffectsName: CHO DPPER-ZFeatures: High Gain AMP Simulation,3 Band EQ3 Band EQ: Treble, Mid, and Type: Distortion Pedal,Guitar Effect Pedal,Guitar pedalboardcolor:As shownMaterial:aluminium alloyPackage Contents:1 x Guitar PedalOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.