Description:DIY homemade fruit battery power electricity-generating experiment，educational science physical DIY power generation experiments toy. A wide variety of experimental materials can be found at home, oranges, tomatoes, potatoes, apples, etc. Happy and easy to learn, exercise your children's practical skills. Through experiments, children can explore and understand the mysteries and improve their hands-on ability. Great for classroom science power generation experiment. Specification:Material: Copper and zinc Cable length:26cm/10.24inch Package Includes: 4 Pieces Zinc Sheet 4 Pieces Copper Sheet 2 Pieces Lamp Beads 6 Pieces Cable(2 Pack) Note: Note that only 1-2 fruit is basically not work, the current is too weak, it is recommended more than 4, the more the better. Production methods: the copper and zinc into a fruit, copper and zinc is a fruit battery positive and negative. Do a few more combinations, series and parallel can form a greater current.