Easily Tune Any String On Your Guitar With This Easy-To-Use Pedal Simply Plug Your Guitar"s Input Into The Unit - Output Impedance: 10K? - Jack: Input, Output1 ,Output2 AC Adaptor * You Can Even Use The Pass Through To Hear Yourself Play While You Tune Up - Current Draw: 25ma(DC 9V) - Controls: Pedal Switch * Normal Input Level: -20dbu - Residual Noise: -106dbu (IHF-A, Typ.) - Power Supply: DC 9V; AC Adaptor * Input Impedance: 1M? - Tuning Frequency Range: 31.7722 Hz (C2)--4022.9040 Hz(B4) * Normal Output Level: -20dbu - Tuning Precision: ±2 Cent