Put this robot mini vehicle together,then add salty water to the power compartment and off it goes! NO Batteries required! It's amazing! A great chance for children to learn about this new energy, see how amazing it is to just add salt water to make the robot. FC module includes 3 parts, the Magnesium metal sheet is a consumable item, one sheet can make the robot for about 4 hours continuously. Kit includes 3 Magnesium metal sheets. Children can experience the joyance and achievement with the assembly, which can help to cultivate their innovation and intelligence.