Mxr m103 case octave pedal as reported by Reverb. Blue has become an octave effect icon, one page after another, simple buttons allow you to mix those that look like nothing.
Mxr according to Wikipedia. Rochester, york effects pedals, 1972 keith terry sherwood innovations, inc. Branded property that continues the original effects with the line.
Blue box fuzz in agreement with Jimdunlop. This insane jimmy fool rain octave blue takes your signal in duplicate, huge, the tone.