Little Treasures Solar Powered Concept House Kit Is a Future Architect's Dream Toy! The concept house can be powered by solar or batteries, giving your child the chance to compare and contrast different energy sources! The toy kit includes everything needed to build and power a concept house! The Little Treasures toy is built of safe, non-toxic, environmentally friendly materials. Recommended for children who are ten years of age or older. Build the house, add power to the house, and watch the magic happen!