Powered by salt water Fueled by creativity For ages 10+ Batteries are not required After the car assembly size: 7.5×4 cm Color:blue+ white As the smallest, least expensive, not to mention first fuel cell car to be powered by saltwater, the Salt Water Fuel Cell Car gives children a chance to learn about New forms of clean energy, while building and powering their very own toy: Just add saltwater and go! This environmentally and kid-friendly concept reflects the new, Cleaner ways we think about automobile production and demonstrates first hand to children a more effective utilization of our natural resources. 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. If you want to park the vehicle, simply take out the fuel cell module and rinse with tap water and dry.