KNOG Boomer Front Light 1 Hi-Powered LED Flexible silicon body with an integrated clip feature allows for quick mounting (ideal diameter 22 to 32mm) Burn time of 4 hours constant, and 36 hours in flashing mode 50 lumens output 4 modes: Constant, Strobe flash, Fast flash, Random strobe Uses 2 AAA batteries (included) 53 grams (including batteries) To be used as a safety light only