I hadn't used it for a while, so I stored it in its dedicated soft case. * The internal battery was just replaced. * Sound output has been confirmed. This is a set including the main unit, dedicated soft case, 32MB memory card, and AC adapter. There is no instruction manual, but I believe you can view and download it from the following URL: https://jp.yamaha.com/products/contents/music_production/downloads/manuals/index.html?l=ja&c=music_production&k=QY100 Thank you for looking.