No instruction manual. Cleaned. Functionality confirmed. There is a crackling sound when increasing the volume. It's fine if you don't move it after increasing the volume. If you are concerned, please consider this if you are able to have it repaired yourself. Digital rhythm machine with drum pattern creation function. - Model: ZOOM RhythmTrak RT-123 - Power adapter: Included - Functions: Drum pattern creation, rhythm track selection - Button layout: Kick, snare, hi-hat, cymbal, and other buttons - Display: Digital display - Bottom: Non-slip rubber feet Thank you for viewing.