Provides 45 lumens of light; Runs for 120 continuous hours;Activates when submerged in water; will Not automatically activate with rain, sea spray, or high humidity;Can be manually activated with easy twist on/off;Visible 3.1 miles (5.0 km) on a dark, clear night which exceeds USCG requirements of 1 nautical mile (1.9 km) visibility;Clip, lanyard cord, and hook-and-loop strap included