Jon it is a mini amp that plugs into your guitar and use headphones. They are good for sitting about practicing
The amPlug Series of palm-sized headphone guitar amps make it easy to enjoy great guitar sounds at home, in your room, or anywhere. Simply plug the amPlug directly into any guitar, attach a pair of headphones, and you're ready!
You will pick up one around 20 to 25 quid new or look used on reverb USA site
