They run completely off solar power, so you don’t need batteries, and they have alternating polarity, letting them move forwards and backwards. The robots have movements based on their shapes, and some are even designed to operate in water! With the solar energy panel and clear gear-housing, the educational value is huge, teaching you about robotics and new power sources all at once! There are 2 different levels, for beginners and advanced builders, letting you build more detailed robots as your knowledge grows. It’s a build-it-yourself robot kit. 14 different moving robots to create. Works on land and in water. Runs entirely on solar power – no batteries required.