【Interactive Fun】Swing it by hand to keep this newtons cradle rocking around with battery power, providing an interactive and entertaining experience. 【Educational Device】This perpetual motion machine is an excellent educational and science device stimulating interest in physics and exploration, fostering a love for science. 【Colorful Rotating】This swinging toy has brightly colored balls that rotate like a sky wheel, adding a vibrant touch to any space. 【Elegant Design】The pendulum balls feature an elegant and innovative design, ideal for festivals and office desk decoration, making it also a beautiful gift. 【Intelligent Art】This newtons cradle balance balls adopt novel design for children to have fun, doubling as a piece of revolving art for your desk, combining entertainment and aesthetics.