Charge your mobile devices with just heat and water.

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Saw this product on Shark Tank. Cool concept for 3rd world countries
Any idea how much juice it produces? Half a charge on a typical smartphone? Looks brilliant, many use cases, haven't seen any competition either.
This is so perfect for hardcore hiking. Should be a huge seller among Canadians as well as apocalyptic doomsayers looking to keep a technological edge.
Glad to see this. I've been worried about how I was going to be able to keep my phone charged after the zombie apocalypse.