Spin it by hand and it will use the battery to keep spinning. Made of high-quality materials, safe and smooth to the touch. A simple and modern style with lots of fun, it's also a kinetic art piece for your desk. It requires 4 AA batteries and will swing until the battery is depleted or you stop it. A perfect gift for your friends or family, a beautiful craft ornament. Specification: Material: Iron Plastic Battery: 4 * AA batteries (NOT included) Color: As shown in the pictures Process: Electroplating Package List: 1 x Perpetual Motion Model Decor