The Flamethrower was actually a somewhat “ancient” invention used during the Byzantine Empire to shoot fire, and reinvented more recently for the same nefarious purpose. However, the FlameStower is something less menacing and actually could be considered a way to make camping downright civilized. It can charge the batteries of a USB-connected device via a camping or cook fire by conducting the heat to a thermoelectric generator.
The generator is in contact with a water reservoir and the combination of hot and cold produces the energy to juice up a device in a few hours.