This is the somewhat rare VOX overdrive pedal, the Straght 6. Its sound leans towards the TS系 (Tube Screamer) style, with features like a gain that can be cranked up quite high, the ability to individually control the bass, and a bright switch that allows for sounds reminiscent of VOX AC or Marshall amps. You can feel the characteristics of a vacuum tube in its range and the warmth of its overtones. It also takes a little time for the sound to come on after powering it up. This one is original and hasn't been modified, but apparently, you can change the flavor by swapping out the vacuum tube. Personally, it gives me a feeling somewhat similar to a BB Preamp or an OCD. Operation has been confirmed, and there are no included accessories. Thank you!