This is a wind up style musical movement, Love Story, you can use it to make your own music box. 1).Model:H18NG002 2).Size: 5*4.4*2cm 3.) Material: Metal movement 4.) The sound power from Spring 5.) Use the key to turn the Spring tightly,then release and will be playing 6.) Playing speed: 12-20" 7.) Drum turns available(times): 8 circles 8.) Full playing time: 2-3' 9.) Service life: >=500 times