Pls be noted that this item we sell is unassembled; Powered by salt water; Fueled by creativity; For ages 10+; Batteries are not required; Size after car assembly: 7.5x4cm; Color: blue + white; Smallest and least expensive; 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; 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