Welcome to the shop! Made from high-quality materials, it's safe and smooth to the touch. Simply install the batteries and gently nudge it with your finger. The device will begin to rotate, demonstrating the principles of energy and conservation of momentum. Touch the top to stop the toy. It's powered by 4 x AA batteries (not included). Remove batteries during prolonged periods of non-use. If you've been searching for a unique desk toy, you'll love this. Simple and modern style with lots of fun, it's also a work of art on your desk. Using durable plastic as the base and sturdy stainless steel as the frame, it's the perfect decoration for your room, office, instrument panel, etc. A great gift for friends or family, and a wonderful craft decoration. Your satisfaction is our top priority. We will provide you with the best service. If you encounter any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately, and we will provide you with the best solution!