️2 in 1 Solar & Battery Power ️: Compared with other STEM building robots, our 12-in-1 solar robots can be solar-powered and battery-powered. ️ Latest Upgrade 12-in-1 Engineering Robot️: 12 different building robots can play in any place, like the robot running under the sun and swimming in the water, which can let 8-12 years olds learn about robot construction and various basic physics while playing and develop children's hands-on and imagination skills. Our solar robot toy sets are equipped with solar panels for the toy to drive, but also the option to install battery slots to battery-powered robots.