Fruit Battery Science Experiment Kit with Electronic Clock & RGB LED Package Includes: 4 pieces copper sheet, 4 pieces zinc sheet,1 piece Electronic clock,3 pieces LED,3 pieces Wire, 2 pieces wires with clip Easy to operate: you only need to prepare fruits, vegetables or drinks to assemble a battery to work with led or electronic watches, such as: apples, oranges, potatoes, lemons, tomatoes, cola, pears, pineapples, or salt solutions, etc. By completing the Fruit battery Science Experiment Project with your child, let your child experience the mystery of science, develop your child's imagination and hands-on ability, and make your child more interested in scientific experiments. Read the instructions carefully before building the project to avoid damage to the electronic watch or to prevent the LED from working. Fruit selection:we suggest you use fruit with more juice, tomato will be your first choice, if you choose lemon and orange, please insert copper and zinc tablets in the same petal flesh (there is a membrane between the different petals that will hinder the transfer of electrons), as far as possible, insert copper and zinc tablets all the way into the fruit.The LED lighting effect is more visible in dim environments. CHOKING HAZARD:Small parts. Not for children under 3 yrs. Material: Metal colour: As shown Package Contents: 1 set x Experiment Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.