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 that works with LEDs or electronic watches, such as oranges, potatoes, lemons, pears, pines, or salt solutions. By completing the fruit battery science experiment project with your child, let your child experience the mystery of science, develop imagination and hands-on ability, and increase interest in scientific experiments. Read the instructions carefully before building the project to avoid damage to the electronic clock or prevent the LED from working. Fruit selection: we suggest using fruits with more juice. If you choose lemons and oranges, insert copper and zinc sheets into the same fruit segment (as membranes between segments may hinder electron transfer). Insert the copper and zinc sheets fully into the fruit. The LED lighting effect is more visible in dim environments. CHOKING HAZARD: Small parts. Not for children under 3 years. Material: Metal Color: As shown Package Contents: 1 set x Experiment Kit Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. Measurement allows an error of +/- 1-3 cm.