Knog Frog Strobe White LED: Translucent 1 LED Flexible silicon body with an integrated clip feature allows for quick mounting (ideal diameter 22 to 32mm) Visible up to 1/3 of a mile Burn time of 50 hours constant, and 80 hours in flashing mode 25 lumens output 4 modes: Constant, Strobe, DISCO Strobe, Epileptic Fit Strobe Uses 2 CR2032 batteries (included) 19 grams (including batteries) To be used as a safety light only