Build your own solar-powered models and discover how solar cells generate electricity from light.-Build 12+ solar powered models including a Vehicle Jeep, Crane, bulldozer, Lift, Bridge, Fork Lift etc.-Allowing you to switch out the solar panel for a AA battery depending on the strength of sunlight.You can Use AA Battery fir Indoor and solar for outdoor-Can even use the solar panel to charge up your own rechargeable AA batteries.-Solar panel is positionable, so you can maximize its exposure to the sun to generate the most power.-Kit gives step-by-step instructions for assembling the six model vehicles but you have to use your skill to assemple it simple.-Can design your own solar vehicles.-Ages 5 and up. Includes: – color instruction book included. Specifications: -Kit consists of TWO solar cells and generates 1.5 volts of electricity in bright sunlight, like a AA battery. Assembly Instructions: -Assembly required. Dimensions: -Guide book dimensions: 5.5” W x 8.25” D. AA Battery not included is needed.