You'll be amazed to find what you can learn because after you have correctly assembled the Greenex collection you will master the basic knowledge of modern mechanic and electronic. The Greenex series is an exciting learning experience, and is smartly designed that it is easy to build it yourself. Most importantly, the main concept of this collection series is environmental protection. Children will be amazed to use the solar power to operate the product. The Greenex series is targeted at encouraging children to learn how to protect and look after the enviroment. Therefore, children can discover and play in an ecofriendly way. Build your own solar powered house with this great kit. Solar eco house operates on natural sunlight, or batteries when indoor. See the magnificent house come to life with Solar LED sign display, solar door sound and solar windmill. This kit is perfect for kids 12+.