FUNNY: simple and modern style with lots of fun, this perpetual motion wheel instrument is a rotating artwork on your desk, which can relieve your stress. EDUCATIONAL: Ideal for music enthusiasts science or to demonstrate the laws of physics in science classes. Help your children explore the meaningful values of physics. FUNCTION: The shaking device requires 4 AA batteries, swing it by hand and it will use the power to keep swinging until it runs out from the battery or until you stop it. QUALIYT: This electronic perpetual movement is made of high quality stainless material, safe and smooth, powered by AA batteries (the batteries are not included). GIFT: This globe toy is a perfect gift for your friends or family. A good DIY ornament would make a beautiful landscape because of its decorative design. Specification: Material: Iron Plastic Battery: 4*AA batteries (not included) Color: as pictures shown Process: electroplating Size: 11 * 19cm / 4.3 * 7.5inch Package List: 1 x Perpetual Motion Movement Decor