Normal Input Level :-20dBu Input Impedance : 1M OMEGA, Output Impedance: 1k OMEGA Recommended load Impedance: 10K OMEGA or greater Residual Noise : -100dBu (IHF-A, TYP.) Jack : Input, Output , AC Adaptor Variable Range : Equalizer control: +/- 15Db Level Control: +/-15dBr Power Supply : DC 9V, Dry battery (6F22/9V), AC adaptor Controls: Pedal switch, Equalizer Control Knobs( 100,200,400,800,1.6k,3.2k,6.4kHz), Level Control knob.