NO BATTERIES NEEDED
Featuring some sort of magic powers, the Survival Frog HydraLight Mini Flashlight is powered by water. Just “dip the bottom of the unit in water for 10 seconds and you’ll have instant light.” The flashlight is powered on for 10 hours. Re-dip in water and the flashlight is good for another 10 hours of light making magic.
SOURCE/PHOTO: Survival Frog