The POWERplus Marlin is an amazing model car that is powered by salt water. It uses the latest in fuel cell technology to power the car as it needs only a few drops of salt water to drive the eco way. It will teach children and adults about renewable energy solutions Fun for all! Features Easy to use, simply insert or take out the salt water fuel cell to switch on and off. Batteries are not required, just add a few drops of salt water Includes 3 extra H2O fuel cell strips - each one runs for up to 4 hours Extra fuel cell are available