Feature: 1. Better Demonstration: The perpetual motion ornament is like a three dimensional ball, moving smoothly and swaying left and right, which is a beautiful landscape on the desk. You can also learn the science in this model. 2. Elegant Design: The perpetual motion ornament has sporty elegance and is an innovative design to bring more fun to your office. The perpetual motion ornament adds scientific charm and mystery to your office or room. 3. Learning Knowledge: The perpetual motion ornament has a simple base with a moving ball built on top. You and your child can learn science knowledge from this model and stimulate the interest of your children in science. 4. Perfect Decoration: The perpetual motion ornament is perfect for your office or outer space themed room. The perpetual motion ornament will attract you and anyone else watching it for hours. 5. Easy Installation: The perpetual motion ornament is easy to install and remove. And it is a great present for friends and family. Even people who have never learned about it can easily install it. Specification: Item Type: Perpetual Motion Ornament Material: ABS, Stainless Steel Battery: 4 x AAA battery, shipped without battery. . Package List: 1 x Perpetual Motion Ornament