Optical volume pedal with familiar linear taper. Minimum Volume knob is used for a smooth transition between rhythm and lead volumes. Designed for use in amp FX loops (send and return) or in front input of amp. Powers from one 9V battery or optional Morley adapter. LED Indication, cold-rolled steel housing, quick clip battery door and two-year warranty. Turn it up! Features include: · Morley's Electro-Optical circuitry ensures noise free, dependable operation · Consistently smooth linear taper is set to Steve's painstaking specifications · Designed for use in effects loop (send & return) or in front amp input · Minimum Volume knob is used for a smooth transition between rhythm and lead volumes · 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 · Works with guitar, bass or keys