18 Note Windup Clockwork Mechanism DIY Music Box Musical Movement Send Via Express Delivery, Arrive in 10-15 days. EASY TO USE: Musical mechanism for DIY your music box, very easy to setup! HOW TO USE: The sound power from Spring,use the key to turn the Spring tightly,then release and will be playing. MULTI OPTIONS: Many Songs for chose! You can find the one suits you! NOTICE: The music movement just play a part of song ,not play the whole song, In order to magnify the sound,you can touch the movement on something when playing.