It is electric bell for electricity teaching. It helps children to consolidate the knowledge in text books and gain a deeper understanding of of current. By setting up simple circuits, it is easier for your child to learn basic electrical rules and improve your child's hands-on ability, thinking ability, creativity, and improvement. The excellent workmanship of our product will bring you a . Features - -blue - Material: Plastic, iron. - Size: 10.50X7.50X3.00cm/4.13X2.95X1.18inch. - Made of premium plastic and iron materials for and use. - Fine workmanship and creative appearance ensure its popularity and practicality. - Very suitable for teaching the basic principles of electricity and the working principles of simple circuits. - These lightweight physics experiment equipment are perfect for physics demos and projects in school. - The excellent workmanship of our product will bring you a . Package list: 2 x Electric Bells