UST See-Me Select Led Light and Strobe SELECT LED light Coast guard- approved Personal locator Each unit has 2 LED lights that burn at up to 28 candela each, over 35 times as bright as required by the U.S. Coast Guard In steady light mode, the lights burn for 24 hours on one set of batteries, 3 times longer than required by the U.S. Coast Guard In strobing mode, the lights burn for 27 hours on one set of batteries, over 3 times longer than required by the U.S. Coast Guard USCG Approved/SOLAS Compliant Waterproof, weatherproof, impact resistant, designed to be used with (2) AA Alkaline or (2) AA Lithium batteries