This is a clone of Cafe au Lable's Amateras0001. It's a passive device that requires no power, but it subtly saturates the sound, adding a core and thickening the tone just by passing audio through it. It was useful when I wanted to give my sound more presence without changing its basic character. It works well with guitars and basses, and may also be suitable for synthesizers if the impedance is compatible. It's small and doesn't require power, so I could place it anywhere on my pedalboard, which was very convenient. I'm selling it because I'm changing my pedalboard setup. *Please note that the recommended input impedance is 1kΩ or less.* Here's a link to a comparison video with the original unit, provided by the maker: https://youtu.be/I2w54vKCMUI Body only. Operation confirmed. Velcro is attached to the back.