All the accessories in this product are specially designed for student experiments. Please use them under the supervision of teachers and parents to ensure safety! Do not consume any of the products! They are not suitable for children under the age of three. Do not approach fire sources. Before assembling any products that use batteries, please check if the circuit is clear, if the components on the circuit are complete, and if all contacts are in good contact. Remember that on the battery, + is the positive terminal and - is the negative terminal. Be careful during the assembly process, and if you use glue, do not get it in your eyes or on your skin.