Red5 Educational 14-in-1 Solar Powered Robot Kit (Ages 10+).

They run completely off solar power, so you don’t need batteries, and they have alternating polarity, letting them move forwards and backward. The robots have movements based on their shapes, and some are even designed to operate in the water! With the solar energy panel, 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.