Joyo JF-312 Pipebomb Electric Guitar Single Effect Output volume control Compressor Sensitivity Adjustment Mixing ratio for original signal and compressor signal Attack response time adjustment True Bypass Input Impedance:1M Output Impedance:10K Running Current 10mA Power: DC 9V adapter (negative polarity) Dimensions 73(L) * 43(W)* 50(H)mm Plug in 9v DC Adapter (not included) JF-312 Pipe bomb ( Compressor), NEW mini Guitar effects pedals from JOYO.