YAMAHA QY100 Memory Backup Battery Replaced - Sequencer Yamaha Operation confirmed. (Checked in test mode.) No noticeable scratches, in good condition. The internal memory backup battery was replaced with a new one at the time of listing (December 13th). Includes the original adapter. (This is currently working without problems, but it's a used item and may show signs of age, so please consider it as an extra.) Items included: Main unit Original adapter (PA-3B) Only items shown in the pictures. Thank you.