Connect to the Environment! With this Eco-House construction kit, your kids build their own miniature house that is powered by solar energy outside and battery power when inside. Use this kit as an educational example of how solar power and other alternative green energy sources work. Once the house is assembled, your kids will love watching it come to life! Watch the solar LED sign display, hear the solar door sound, and watch the solar windmill start spinning! A cool gift for anyone who is interested in models and alternative energy! Requires 2 AA batteries for indoor use. For ages 8 and up.