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Perpetual motion continues indefinitely without any external source of energy. This is impossible to ever achieve The Perpetual Motion Machine, a hypothetical machine, that can work indefinitely without an energy source because of friction and other sources of energy loss, and the violation of the first or second law of thermodynamics. Description of the item: Design is stylish and innovative. This display of kinetic energy will take you on a ride and keep you mesmerized for hours. After installing 4 batteries(not included), move lightly, it would keep going on rocking around. Material:Metal And Plastic. Size Reference:Approximately 9" tall x 6.5" wide with 4" diameter base,please check the size detail before your purchase. Package Include:1pcs Perpetual Motion Toy.