Input Impedance :1M OMEGA Output Impedance: 1K OMEGA Recommended load Impedance: 10K OMEGA or greater Residual Noise : -90dBu(IHF-A, TYP.) Jack : Input, Output A (MONO)/B, AC Adaptor Power Supply : DC 9V, Dry battery(6f22/9v),AC adaptor Controls : switch, Level, F.Back knob, D. Time knob, Mode knob