Feature: 1. Battery Powered: The Musical mechanism movement is battery powered with 2 AA batteries (not included) for ease of use. 2. Soothing Music: Take this little music movement, wind it up, watch the little gears turn, and listen to music that soothes your ears. 3. DIY: You can install the movement into DIY boxes, such as paper boxes, wooden boxes, glass boxes, plastic boxes and metal boxes, and you can make your own music box. 4. Easy to Operate: You can also not need to put it in the box, just play it on the table, watch its gears move and listen to the pure tune. 5. Acrylic and Alloy: Music box mechanism is made of acrylic and alloy, which is not easy to damage and can be used for a long time. Specification: Item Type: DIY Clockwork Music Box Material: Acrylic, Alloy Product Use: Suitable for Birthday Gifts, Musical Enlightenment, Etc. Batteries: 2 AA Batteries (Shipped Without Batteries) Size: Approx. 5 x 4.5 x 2.3cm / 2.0 x 1.8 x 0.9in. Package List: 1 x Battery Box (Shipped Without Batteries)1 x Movement4 x Screws