This is a 49-key roll-up piano. I purchased it in November 2022, but I haven't used it much, and I've only charged it a few times, so I don't think the built-in battery has deteriorated much. I have confirmed that all the keys produce sound, but I haven't checked anything else. There are no scratches, but the material tends to attract dust, so please refrain from purchasing if you are concerned about minor details. The item for sale is the main unit only. No claims and no returns accepted.