Specifications:You may experiment with different fruit like lemon, orange, tomato, etc.Learn about electricity and chemical reactions in an innovative way, and demonstrate the principle of an electrochemical cell.Educational toy for your kids, more trial and entertainment.Item Type: Fruit Battery KitMaterial: Plastic, Metal, Electronic ComponentsFeatures: Durable, Easy to Operate, Bio Energy Experiment, SafePlate Size: 5cm x 1cm/1.97" x 0.39" (Approx.)Wire Length: 15cm/5.91" (Approx.)Usage:1.Prepare zinc plate, copper plate, wire, electronic bell or light emitting diode, potatoes, or other fruits and vegetables.2.Knead the fruit, make it more loose to facilitate water flow.3.Insert two electrodes, then connect wires and electronic clocks.Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:3 x Wires1 x Digital Clock1 x Light Emitting Diode3 x Copper Plates3 x Zinc Plates