A flashing signal light, with 300 hours 100% brightness, visible over 2.5 miles, to aid rescuers in locating a person or persons. State of the art, U.S.C.G. approved, water-activated LED strobe rescue light. Designed to meet the demands of the sea, it is ideal for use on life vests, life rafts, safety harnesses, survival suits and many recreational uses. Simply attach to your safety gear and forget it.