Thank you for viewing. Early numbering specification. Units without LEDs and with psychedelic paint are rare in the used market. In my subjective opinion, this is a fuzz that is a more modern take on the Foxx Tone Machine. The orthodox way to use the octave is to step on it and play the screaming up-octave from the 12th fret onwards. If you step on the SWELL switch after stepping on the Octave, you can reproduce the flickering of a mysterious sound like a tape echo in reverse. I also owned later LED-spec and numbered psychedelic-painted units, but the early ones have a completely different thickness and sustain. The clean tracking when the volume is turned down is also good. It is a fully functional product with no defects. I used it on stage once at a live performance the other day, but other than that, it has only been used indoors. I will answer detailed questions. This unit only runs on batteries and does not have a DC jack. No claims and no returns, please. (Added October 3, 2025, 21:31) The transistors are 2n3904. As you can see, the circuit board is not a printed circuit board, but the wiring is hand-wired. Numbering No. 1563. I think this is something that rarely appears on the Japanese market anymore. I had the original box when I bought it. If you wish, it will be packed and shipped in the original box. I don't really want to sell it, so I might stop listing it on a whim. Please consider it as soon as possible. The following is a copy and paste from a musical instrument store. The sound of the normal fuzz, octave fuzz, and swell fuzz are all wonderful. (We recommend playing it at full volume!) It is possible to create a very unique sound, and it is understandable that it is a long seller. It has a very simple and distinctive shape, but it reigns as a popular model of the company, and the fuzz sound produced from it is exceptional. The foot switch is a little different, and you may get lost if you are not used to it. First, turn it ON/OFF with the FUZZ switch, add the octave component with the OCTAVE mode switch while the FUZZ is ON, and then switch to the SWELL mode while the OCTAVE mode is selected.