JOYO JF-30 A/B Switch Guitar Effect Pedal True Bypass AC Adapter DC 9V Output impedance: 0 Ohm Input impedance: 0 Ohm Running current:2mA Power:6F22 9V Battery / DC 9V adapter Firstly, channelling indicator light secondly, operating without power supply thirdly, true bypass design Using the A/B switch to dispatch the signal to two different installations There are including three parts