Joyo JF-322 Wow Wah Auto Wah Electric Guitar Single Effect Controls: Sensitivity Bias Resonance Decay True Bypass Input Impedance:500k Output Impedance:10K Running Current 22mA Power: DC 9V adapter (negative polarity) Plug in 9v DC Adapter (not included) JF-322 Wow Wah Auto Wah, NEW mini Guitar effects pedals from JOYO.