Small battery /mains powered bass amplifier . I've owned this from new,I bought it from Back Alley music in Warrington, the on/off switch became faulty last year so I had it repaired and serviced at Gee electronics also in Warrington ,whilst this was being done,I was bought the new version as a birthday present otherwise it wouldn't be fore sale. These are excellent pieces of equipment and are great quality, I've used it live ( miked through a PA) and recorded using it. Loads of great features ( the rhythm box is great) I have all the original packaging and manual. The original power supply was lost at a rehearsal room but I've got a Roland Japan power supply which was with an electric piano I had and this works perfectly. (The bloke at Gee electronic said it was better than the original item) it's in full working order and you are welcome to try it out. Best offer before next weekend can take it. I can deliver locally for free.