Joyo JF-316 Future Chorus Chorus Electric Guitar Single Effect Level - Contrast proportion Depth - Depth of the chorus effect Chorus Speed True Bypass Input Impedance:1M Output Impedance:10K Running Current 22mA Power: DC 9V adapter (negative polarity) Dimensions 73(L) * 43(W)* 50(H)mm Plug in 9v DC Adapter (not included) JF-316 Future Chorus , NEW mini Guitar effects pedals from JOYO.