Convert sunlight into electricity and learn all about solar energy and solar panels with the Greenex: Solar Water Wheel Science Kit! Build your own water wheel and connect it to the solar power station, then put it under natural sunlight. Perfect to play under the sunlight and see the amazing windmill in action! The Greenex Series is 100% battery-free eco learning fun that connects the environment to amazing science experiments. Smartly designed, each Greenex kit allows kids to snap the pieces together with ease. Simply snap all key components and modules together to start and then pull apart once finished. These kits encourage kids to experiment on their own for additional learning. Best of all, each kit can snap to another to integrate functions and double (triple, quadruple) the fun!