UST Marine 1.0 Manual See-Me Light Field tested to ensure reliability Made using high quality materials All your safety and survival aid products for inshore and offshore use Coast Guard approved personal locator light that emits 360 degree light that is visible up to 3.4 miles Unbreakable lifetime LED bulb never needs replacing Provides 20 lumens of light and runs for 17 continuous hours Impact-resistant and waterproof (IPX7 rating) Easy twist on and off