Play, buid and learn with the sun. This kit is suitable for children aged four and above with the mobilo solar energy kit (item no. 248). children have the opportunity to build a wide range of toys, such as helicopters, windmills, planes and many more. They are only limited by their own imagination. As light strikes the surface of the solar propeller, it will start to rotate- without battery, cable, or power outlet. Age: 4- 10, Pieces: 14.