The Morley ABC Switch enables you to route one guitar to three amps OR route three guitars to one amp. Then, combine or select any combination of inputs and outputs. True Bypass circuit design prevents signal loss or tone change and passive design requires no power. One 9V battery or optional 9V adapter required for LED indication only. LEDs show you which amp(s) and/or guitar(s) are on or off. Cold-rolled steel enclosure decked out in royal blue. Two-year warranty.