Route one guitar to three amps. Then select or combine any combination of all three. Boost knob allows you to increase output to all three amps. Powers from one 9V battery or optional Morley adapter. LED Indication, cold-rolled steel housing, quick clip battery door and two-year warranty. Features include: · Route one guitar to three amplifiers · Select or combine any combination of all three amplifiers · LEDs show you which amps are on/off · Boost knob allows up to 20dB of clean boost to all three outputs · Powers from one 9-volt battery or optional Morley 9V adapter · Cold-rolled steel housing, LED indication, quick clip battery door and two-year warranty