The Scooblite from ISC is the ultimate glow stick because it is reusable, reliable, safe for the environment, and can be used anywhere!!! The Scooblite charges from ANY light source: daylight, flash lights, LEDs, etc. and once charged it will glow as a marker all night long. The Scooblite can be reused over-and-over again FOREVER! Charge the Scooblite with your dive light before your go into the water or while you're in the water. It absorbs light similar to your glow in the dark watch dials.