A small transducer, housed in a maple disk, sticks to the surface of your guitar near the bridge with a special adhesive. The adhesive allows it to be removed and re-stuck many times without affecting the finish of your guitar. The Artist pickup has many other uses besides amplifying acoustic guitars. It's a great pickup for Violin, Cello, Stand-up-Bass, Banjo, Mandolin, Piano, Horn, or practically anything else you would ever want to amplify. They've even had a mechanic use one to pickup (pardon the pun) knocks and vibrations in engines. The bottom line is: if it vibrates, the Artist Pickup will catch the vibrations. You do whatever you want with them after that.