YAMAHA QY100 Sequencer - Tested and Working Backup battery replaced with a new one. Checked items: LINE input/output OK MIDI input/output OK Memory read/write OK Power adapter and battery operation OK Buttons OK LCD display OK It's difficult to check all functions, so please comment if you have any concerns. Due to its age, there are some scratches as shown in the photos, but it's in relatively good condition. Included accessories: Power adapter (Soundhouse compatible). SmartMedia 64MB - Read/write OK Please consider the accessories as a bonus.