Solar power fun! Build your own amazing eco-friendly robot powered by the sun with a 360 degree adjustable solar panel and/or a handle generator. The Robot moves forward and backward. 100% battery-free toy! For ages 8 . 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. Encourages 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!