Features: 1.Multifunctional: Made of metal and plastic, this perpetual motion device is the perfect decoration for theme parties and a fun and practical physics prop. 2.Relaxing: The perpetual motion desk toy can be placed on your desk and watch the toy swing, allowing you to enjoy a nice relaxing time after work. 3.Easy To Use: This perpetual motion swinging toy doesn't need much space when placed, no complicated operation, everyone can play with it. 4.Usage Scenario: Perpetual motion device ornament can be used as an exquisite decoration at home, school or office, it's a desktop toy for both adults and children. 5.Ideal Gift: The perpetual motion machine toy can be an ideal holiday and birthday gift to share with your family and friends. specification:Item Type: Perpetual Motion Device Material: Plastic, Metal Product Use: For Desktop Ornaments and More Battery: 4 x AA Batteries (Shipped Without Batteries) PackageList: 1 x Shake Ball 2 x Bracket 2 x Standing Board 1 x Base