Building on the 20-year legacy of the famous BOSS BF-2, the new BOSS BF-3 Flanger Pedal gives guitarists and bassists an updated version of the classic BOSS flanger with the thickest stereo flanging sounds ever. Two new modes (Ultra and Gate/Pan) create stereo flanging with incredible depth even Slicer-type effects and sounds that seem to swirl around the listener.DC IN JackIt accepts the connection of an AC Adaptor (PSA series; sold separately). By using an AC Adaptor, you can play without being concerned about how much battery power you have left.Check IndicatorThis indicator shows whether an effect is ON/OFF, indicates the tempo (TEMPO mode), and also doubles as the Battery Check indicator. The indicator lights when an effect is ON.Output Jack A (Mono), BThe output jacks are used to connect the unit to an amplifier or another effect unit. For mono use, make the connection to the OUTPUT A (MONO) jack.Guitar IN JackThis jack accepts input signals coming from a guitar, some other musical instrument, or another effects unit.BASS IN JackThis jack accepts input signals coming from a bass guitar. BASS IN is disabled when the GUITAR IN jack is used.