Reddit reviews BephaMart 40x40MM Thermoelectric Power Generator Peltier Module TEG High Temperature 150 Degree Shipped and Sold by BephaMart
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Feature: Colding side posts with the wordsHeating side is empty Red wire to positive, black wire to the negative, it generate electricity when the temperature difference happened
Pretty cool. It utilizes a thermoelectric power generator. You can buy them on amazon.
I grabbed one a while back after someone on this reddit posted a video of a guy charging his phone by putting kindling in a coffee can, lighting them on fire, and sticking one on the side.
You can generate the electricity with cold too.