Welcome to the store! Battery Powered: This 18-note musical mechanism is powered by 2 AA batteries (batteries not included) for easy operation. Therapeutic Function: The movement of the music mechanism has a therapeutic effect. Simply play the core on the desk, watch its gears turn, and listen to the pure melodies – it's fascinating. DIY Fun: The music box mechanism can be installed in a cardboard box, wooden box, glass box, plastic box, or metal box. Create your own unique music box! Acrylic & Alloy: The music box mechanism is made of acrylic and alloy, making it durable and long-lasting. Perfect Gift: This musical movement makes a perfect gift for your friends, family, and colleagues for Christmas, Thanksgiving, and more. They're sure to love it! Item Type: 18 Notes Musical Mechanism Movement Material: Acrylic, Alloy Product Use: Suitable for birthday gifts, musical enlightenment, etc. Batteries: 2 AA Batteries (Battery Not Included) Includes: 1 x Battery Box, 1 x Movement, 4 x Screws Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!