This salt water fuel cell car gives children a chance to learn about new forms of clean energy while building and powering their very own car that runs on salt water. Kids will be awed by the remarkable simplicity and effectiveness of the toy. After activating the fuel cell module with a saltwater mixture, the magnesium metal sheet (3 sheets included) can operate the car for about 5-7 hours continuously. An excellent choice for a science fair project on alternative energy, this also makes a great gift!