JOYO Infinite Sustainer (EBow copy)

"The JOYO Infinite Guitar Sustainer is used to produce a variety of sounds not normally playable on a guitar using traditional strumming or picking techniques. These sounds are created by placing the JGE onto/above the string. The JGE drives the string using a magnet to vibrate a sustained note."

Powered with 9v battery (not included)

We bought this in second-hand - but it's in fantastic condition. You may find the odd teeny mark on it at close inspection, but only if you're a fusspot.
Comes with box and quick start guide.