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This mechanism plays the tune Nocturne Op. 9 No. 2 (Chopin). You can include this mechanism in any of the following music boxes.

The mechanism will sound when it's winded up and you open the box. It works like a mechanical clock: you have to turn a key (wind it up), and then the mechanism will sound automatically when you open the box until it runs out or the music box is closed. It lasts around 4 minutes sounding in a 40 seconds loops.