Threshold control: variable from -30 to -10 dBu Slope control: variable from 2:1 to infinity Attack control: variable from 10ms to 100ms Level control: -infinity to -3dBu Low Distortion: (<0.2 %) Gig-saver bypass (signal passes even if your battery dies) Power: Nine-volt battery or optional universal power supply Heavy Duty steel construction Inputs: One 1/4″ jack Outputs: One 1/4″ jack Controls: Engage switch Warranty: Three year limited Optional: 9 volt power supply