With the adoption of educational, this model toy can help children develop their interest in science and their intellectual ability, innovative thinking, hands-on ability.Formed by multifunctional feature, it ensures it can cultivate children's thinking ability and hobbies. It can stimulate children's interest in learning and curiosity through DIY small production, and let children understand abstract knowledge.Made of plastic material, it is lightweight.The length of product is 10.8cm, the width is 8.1cm and the height is 13cm.Suitable for school, home, teaching accessories.Item Name: Experiment SetMaterial: PlasticBattery: 2 x AA Batteries (Not Included)Suitable Age: Over 5 Years OldFeatures: Safe, Reliable, CreativeSize Details: 10.8cm x 8.1cm x 13cm or 4.25" x 3.19" x 5.12" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Experimental Principle: The magnetic field composed of two magnets drives the magnets in the water to rotate, thereby disturbing the water flow and generating vortices.Package Includes:1 x Experiment Set