This is the Salt Water Fuel Cell Monster Truck Kit from OWI. Powered by salt water and fuelled by creativity. Salt Water Fuel Cell kit gives children a chance to learn about new forms of clean energy, while building and powering their very own 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. No batteries required, just add salt water. It is easy to take out the Fuel Cell module when not in use. Detailed assembly and operation guide included.