Build your own solar kit with these kits Six different working models including Solar Airboat, Solar Windmill, Solar Wheeler, Solar Plane, Solar Robot & Solar Helicopter Only one project can be completed at a time Great assembling toy for kid to practice their brain & be educated the benefits of solar energy Also ideal to express your kids' interest in science, extremely helping your children on creation Solar powered, fun to play with & requires no batteries Easy to assemble by following the step in instruction To perform a great result please direct use under sunlight For best results use outside in direct sunlight The kit will not work in cloudy or shady locations or under a fluorescent light The kit will not work if built wrong