Analog guitar octaver. Double octave sound was specified for Jimi Hendrix and Jeff Beck. Pedal is an exact copy of Tycobrahe Sound Company Octavia, the model used by Stevie Ray Vaughan. The pedal has two separate level controlers and boost for one octave, and the original dry signal (Volume, Boost). Effect works nicely fast. Power is supplied via the adapter 9 or via 9V battery.