Features: 1.Music Box DIY: You can place this music box movement into paper box, wooden box, glass box, plastic box and metal box to create your unique music box. 2.18 Note: This windup musical movement adopts 18 notes to play the pleasing and interesting song, and the sound is clear and euphonic. 3.Easy Operation: The sound power of this clockwork music box movement is generated from spring, simply to turn the spring and then release. 4.Relaxing Effect: This musical box movement provides therapeutic function for kids and adults, watching the little gears move, and listening to the music, which is pleasing and stress relief. 5.Perfect Gift: You will be very excited after finishing this musical mechanism movement, a meaningful and great surprise for yourself and your friends. specification:Item Type: Windup Musical Movement Material: Acrylic, Alloy Application: Suitable For Birthday Gifts, Music Enlightenment And So On Batteries: 1 x AA Batteries (Batteries Not Included) Product Size: Approx. 5 x 4.5 x 2.3cm / 2.0 x 1.8 x 0.9in ( Manual Measurement, Slight Error May Exist ) PackageList:1 x Battery Box 1 xWindup Musical Movement 4 x Screw