Most of those products utilize solar power, while a few have gone the thermoelectric route. The HydroBee, however, generates electricity using the power of
flowing water – think of it as a portable hydroelectric station.
So, first of all, why bother? Well, solar-powered chargers may work
fine in direct sunlight, but can be thwarted by heavy clouds, tree
shadows, or even just high latitudes. They also don't do a whole lot at
night. Thermoelectric chargers, on the other hand, require you to build
and maintain a fire.
The HydroBee ... well, yes, it requires you to be close to a stream
or river. If you are, though, it will work in even a weak current,
regardless of the weather or time of day.
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