Powered by body heat, Lumen flashlight never needs batteries

The Lumen flashlight uses a thermoelectric generator to transform body heat into electricity to power an ...

GizmagWhether it be for everyday carry (EDC), outdoor adventure, or disaster preparation, flashlights tend to be found towards the top of must-have items. But one common aspect of these luminescent devices is that they're only as good as the batteries inside. If you've ever switched on a flashlight only to experience a flood of frustrated disappointment, you might appreciate owning an "eternal flashlight." Lumen is designed to be powered by body heat, never needing batteries.

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