UST Marine See-Me Auto Strobe Light (Yellow) Water activation strobe Coast guard- approved Personal locator Water activated or manual activation, fast activation in water Can be seen up to 3 miles away in complete darkness Far exceeds USCG requirements for light output/duration, (15 times longer and 6 times brighter than required) Waterproof, weatherproof, impact resistant, faceted octagonal design is easy to grip in wet conditions Light output 45 Lumens /5 candela (minimum requirement by USCG is .75 candela), operation time is 120 hrs (minimum requirement by USCG is 8 hours)