Build your own solar kit with these kits.Six different working models lar AirboatOnly one project can be completed at a time.Great assembling toy for children to practice and empower their brain as well as becoming educated with the benefits of solar energy.Also ideal to express your childs' interest in science， extremely helpful for your children on creative thinking.Solar powered， fun to play with and requires no batteries.Easy to assemble by following the step in instruction.To perform great results， please use under direct sunlight.For best results， use outside under direct sunlight.