MXR® LAYERS™ PEDALM307 The MXR Layers Pedal blooms with rich, organic sustain that imbues every strum and pluck with resonance and depth—pull off chord voicings you never thought possible, compose transcendent melodies, orchestrate harmonic ensembles, create lively stereo pads, and more—all from a standard MXR housing. This pedal requires a 9-volt (300mA) center-negative power supply and can be powered by the Dunlop ECB003 9-volt adapter or the MXR Iso-Brick, the Iso-Brick Pro, and the Iso-Brick Mini Power Supplies. This pedal cannot be powered by a battery.