Coast Guard Approved water activated LED light & strobe provides 264 lumens of light for up to 72 hours in strobe mode. Provides 86 lumens in steady-on mode for up to 24 hours. Steady on light visible for 3.2 miles, and Strobe is visible for 3.4 miles. Activates when submerged in water. Can also be activated manually. Wrist lanyard and hook/loop attachment strap included.