This product has two methods of generating power, and they were equally disappointing.
The Wind Turbine:
This part was about as sturdy as a pinwheel, and after a brief stint on the front of my motorcycle, I found that it (the turbine) had broken off of the charger altogether. Even before it broke, it never really achieved a full charge.
The Solar Panel:
I'd have to say that I either received a lemon, or this product is a fraud that belongs in the late-night QVC catalog. I left this product in the sun for an entire day. An ENTIRE DAY. I got about five minutes worth of charging out of it each time I did so. I had hoped this would serve me well while I was traveling out of country, but it turned out to be a waste of money, space and energy. On top of that, there was no return option when I purchased it. This may have changed since I bought the item a year or so back.
TLDR: Doesn't work. Save your money and rub your hands together to create static electricity instead.