The most unique and non-polluting energy sources you can find on Earth - the potato、 salt water and mud  Be amazed at how they light up a bulb or sound buzzer  Includes experiment guide for making a coin battery、 fork battery、 potato buzz wire game and more  Caution  High Voltage Inspiration! Contains 3 zinc plates、 3 copper plates、 connection wires、 3 plastic cups、 a light tower、 an LED lamp with connection wire、 a sound chip with connection wire、 an experiment record sheet、 adhesive tape and detailed instructions  Suitable for children aged eight and over  The Science Museum has been turning science into a thrilling learning experience for many years、 and have added their special seal of approval to a limited range of toys that they believe support their mission and will engage children in all aspects of science and learning