Kids can build six solar-powered models, including a locomotive, simple-prop plane, bulldozer, helicopter, backhoe and twin-rotor helicopter. They can even compete with friends to see whose solar vehicles will go the fastest! The special solar panel in this kit consists of three solar cells and generates 1.5 volts of electricity in bright sunlight, like an AA battery. The solar panel can also be used to charge your own rechargeable batteries. Comes with a 24-page full-color book with step-by-step instructions. Will also run with an AA battery (not included). Includes 177 building pieces. For ages 8 and up. Size Model measures 8"L x 5-1/2"W x 6"H
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