read to basics of Robugs here.
the worst thing when your young is buy a toy then the batteries run out so the eco-bug with its solar panel defeats that problem.
the Eco bug is just like the first Bug apart from the eco bug has a solar panel on the back of it making it eco friendly like a real
meaning Robugs are even more like a real bug now.
The eco-bug was hard to make the main problem being that when its not sunny and the solar panel is not generating the power from the batteries will back fire and fry the solar panel.
so to stop this we would a diode but we had none of the right size so instead we put a Led in light emitting diode which lights up when its charging from the solar panel.