This is the SLIME, a distortion filter pedal from BANANANA effects. There aren't any sound samples available online, such as on YouTube, so you'll have to imagine the sound. However, this is a very rare item that is already discontinued. It produces a thick sound. I've used it with both guitar and bass, and when used as a booster for solos, it really cuts through the mix. When you play with a strong attack, the filter makes a "mewing" sound, making it a unique item. The effect works great with bass too. This size, this simplicity, and this presence. It's a bit of a novelty item, but I think it's also a very practical pedal. In any case, it's a rare find. Please try it out and listen to the sound for yourself. Functionality has been confirmed, and it works well without any noise. Velcro is attached to the back. No box, just the pedal itself.