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Works really well for some time, then all of the sudden, one day, the little square won't turn green no matter how fast and bright your LED is going. Then it is touch and go. I downloaded the app to my phone, because it was on iur old tablet. Maybe my phone is too old now? It's kind of frustrating, and makes my son sad- but when it works, this little set up is FACINATING!! I know its so simple, but the implications of alternative energy are huge! Just whst our younger generation need to see!