Super Octave OC-3

Super Octave

World’s first compact pedal with true Polyphonic Octave effects
New Drive mode adds distortion to octave notes for a fatter, more aggressive tone
Includes the original OC-2 mode, capable of producing notes one and two octaves down
Poly Octave effect adjustable to play within a specific note range
Bass input for adapting octave sound to bass guitars
BOSS five-year limited warranty

https://www.boss.info/us/products/oc-3/