Features: 1. Kinetic Art Perpetual Motion: It is a fun way to learn science, perfect for kids to experience mechanical fun in classroom education or play with, improving children's ability to explore scientific mysteries. 2. Conservation of Energy: It won't last forever due to air resistance and friction. Newton's Law Kinetic Art Ball can move continuously for 8-15 seconds. Good torque and centroid performances. Not only does it demonstrate pendulum motion, but it helps demonstrate the laws of conservation of momentum and energy. 3. Unique Ornament: Made of plastic, suitable for table sports decoration. Surprise your friends with this clever toy and enjoy the fun of science. 4. Stress Reliever: Fit for decompression in adults, it's great to release work fatigue and stress after a busy day at work, perfect for outer space science-themed classes or office decor, a great teaching tool for explaining eternal physics. Perfect for birthday, holidays, Christmas, and Father's Day gifts. 5. Optional: Yellow (USB Version), Red (USB Version), Wine Red (Battery Version). Specification: Material: Plastic Color: Yellow (USB Version), Red (USB Version), Wine Red (Battery Version) Size: 150 x 100 x 150mm Weight: 225g, 275g Package Included: 1 x Perpetual Motion Machine Decoration Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store