Feature: 1. EASY TO USE: With a simple and modern design, this perpetual motion machine requires no assembly. Interesting toy with power adapter, plug and play, easy and convenient to use. 2. DECOMPRESSION: When you feel tired from work or need to relax your brain for a while, turn on this perpetual motion machine and watch the trajectory of the metal ball, which can help you relieve stress. 3. EDUCATIONAL: Perpetual motion simulator toy helps to demonstrate the law of momentum and conservation of energy, use it in the classroom to share the exciting world of physics and science. 4. ATTRACTIVE: This perpetual motion device utilizes electromagnetic induction and the law of gravity to keep the ball dancing to entice kids to learn more about physical science. 5. GIFT CHOICE: The perpetual motion desktop toy is the perfect gift choice for housewarming, birthday, Christmas and more. It can be given to our friends, kids, family. Specification: Item Type: Perpetual Motion Machine Product Material: Oak Size: Approx. 19 x 14cm / 7.5 x 5.5in Color: Yellow Product Specification: 1 Set Product Use: Household Scope of Application: Most of Scenes Plug Specification: US Plug Voltage: 100-240V. Package List: 1 x Perpetual Motion Machine5 x Ball1 x Power Supply Note: Manual measurement, please allow some errors.