Found this on a click through link on another site, https://www.waterlilyturbine.com/. It is a small portable water turbine that you pit in a flowing stream. It generates power to charge USB devices or 12 volt batteries..
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Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.
Cool gadget - Using the flow of virtually any water source is appealing, and that they integrated a hand crank is pretty cool. Curious how much wind you would need to actually get the blades turning fast enough to make it useful.