The Scooblite is a new twist on the traditional glow stick as it never requires batteries and is made from rare earth minerals. It is reusable, rechargeable, & reliable. Environmentally safe and can be used anywhere. Available in two sizes 6-inch & 3-inch. Great for night diving. The Scooblite can be charged from any light source even artificial light. When charging, let absorb sunlight for 5 minutes. The Scooblite will glow intensely for a few min then will dim to a consistent light for an hour or more if fully charged. It will actually glow all night long at a lower intensity. At any time you can recharge your Scooblite with your flashlight even underwater. The brighter the light you are using to charge, the brighter and longer the glow.