This is a piece of revolving art for your desk. It uses the battery power to keep it going. Once started, it keeps going. This classic desk toy is a great desk decoration or gift. Pick one up for yourself or for anyone in need of a little desktop entertainment. Features: 1. Swing it by hands and it will use the battery power to keep on revolving. 2. It requires 4 AA batteries and will spin until the battery runs out or you stop it. 3. Add some fun for your desktop. 4. Creative design for children to have fun, it is also a piece of revolving art on your desk. 5. Beautiful decoration for your home, desk , office, table, a great gift to your friends or family. Specifications: Material: Metal + Plastic Workmanship: Electroplating Power Supply: 4 x AA Battery (Not included ) Color: Silver + Black Height: 32cm/12.6in Base Diameter: 11cm/4.3in Bracket Width: 21cm/8.2in Weight: Approx. 372g/13.1oz Package list: 1 * Perpetual Motion Model Note: 1. Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding.