Feature: 1. PERFECT GIFT: Clean and modern design, easy on the eyes. You don't need to assemble it because we have already assembled it. Funny perpetual motion toys can also be a perfect present for kids, adults, such as birthday vacation, Christmas, etc. 2. RELAXATION: When you are tired from work or need to relax your brain for a while, turn on the perpetual motion machine and quietly observe the movement trajectory of the metal ball, which will make you forget your worries instantly and mesmerize you. It can help you relieve stress. 3. TEACHING EQUIPMENT: Not only demonstrates the swinging motion, but also helps to demonstrate the law of momentum and conservation of energy, experience the visual display of momentum. Use it in the classroom and share the exciting world of physics and science with your friends and family! 4. ELECTROMAGNETIC DRIVE: This perpetual motion machine utilizes electromagnetic induction and the law of gravity to keep the ball "dancing" to entice kids to learn more about physical science. In addition, adults can feel very relaxed while playing the ball. 5. STRESS RELIEF: This gives your eyes a place to focus when you need to clear your mind. When you're bored and stressed out, you can put it on your desktop, start it up, and quietly watch its mesmerizing swing, and it will mesmerize you. It can kill time and help you relieve stress. Specification: Item Type: Perpetual Motion Machine Product Specification: 1 Set Product Material: Oak Product Use: Household Scope of Application: Most of The Scene Size: Approx. 14x19cm / 5.5x7.5in Color: Yellow. Package List: 1 x Perpetual Motion Machine5 x Ball1 x Power Adapter