These are the remote controlled racecars that are powered by three different renewable energy sources. With a miniature windmill, solar panel, and hydrogen fuel cell, this set demonstrates the possibilities that wind, sun and water present for sustainable energy. The wind and solar stations provide up to 20 minutes of racing time from a 10-30 minute charge, depending on wind speed and brightness of the sun; the hydrogen fuel cell provides five minutes of run time from a three-minute charge. The simple remote has left/right and forward/reverse controls, a 10' range, and can be used to charge the cars in one minute when time or natural resources prove scarce. Includes a manual that explains the science behind each power source. The vehicles fit in the palm of a hand and may be used interchangeably with any of the chargers and remotes. Requires 6 AA batteries (for 3 remotes). Ages 5 and up. (2 1/4 lbs.)