Children expand their STEM skills and explore how sunlight can be converted to electrical energy with this easy-to-use kit! Kids just recycle their own plastic bottle and use it with the materials from the kit to build their very own solar-powered airplane mobile—no batteries required! Kit includes plane parts, a propeller, a motor and weight components, plus a detailed assembly guide. Mobile structure measures 9 1/2" long; plane glides on included hanger only.