I've only used it a few times since purchasing it, and it's in beautiful condition. Sound output has been confirmed. The batteries will be removed before shipping. This is a listing for the main unit only. A 16-pattern rhythm machine that generates techno sounds. - Model Name: PO-12 - Function: Rhythm Machine - Number of Patterns: 16 - Sound Type: Techno - Power: 2 AA batteries - Display: LCD display - Operation Buttons: 16 buttons Thank you for looking.