The device would feature a small thermogenerator that would convert heat into energy. The idea would be to be able to put the device in your pocket, and thanks to body heat, give the device a slight charge throughout the day, whenever it is in your pocket. Theoretically, this would give the device a small charge, but it could get a big boost of energy if you were to put it on, say, a heater.

Or.

If you're already very hot, then, a heater would be unnecessary as your "hotness" would be sufficient for the recharging of your battery. No more dead batteries!

But its not out yet, nor does it come in Black.