YAMAHA QY100 A compact music production tool with sequencer function This is a very old item, so please understand that it is a used product. There were no problems with startup or operation, but a Backup Batt.Low error is displayed. The internal button battery needs to be replaced to enable the memory function. A Roland MIDI USB cable (UM1) and a YAMAHA AC adapter (PA3B) are included, although they are not original. Other accessories: Instruction manual Data list Installation guide