Hydralight: The HydraLight is more than just a flash light. Hydralight becomes flashlight and lanterned that supplies light to the entire area and it activates by water. Rechargeable Light: Once its cells dipped into the water, Hydralight turned on lasts for hundreds of hours. All we need for activating this hydralight is water. Most importantly, hydralight shines in day, night, rain, thunderstorm etc. This light can be charged by dipping its cell in river or it can also be charged by rain water. Emergency Light: The Hydralight 2-1 flashlight is nice to have for emergencies and power outages, and is useful for camping, hiking, hurricane, power outrageous, backpacking, outdoors, car auto emergency, thunderstorm areas. Portable Light: You dont have to worry about charging cables or battery, hydralight gets rid of all those things. It’s easy to take the hydralight anywhere you needed. It’s quite secure and small to take everywhere. Disclaimer: No Batteries: Refers to TRADITIONAL BATTERIES, typically used in flashlights, which make electricity from energy stored EXCLUSIVELY INSIDE the batteries. The HydraLight uses a Fuel Cell which is not considered a TRADITIONAL BATTERY as it requires EXTERNAL elements, such as water, to make electricity.