KNOG Frog Strobe Rear Taillight 1 LED generates 2.5 lumens for 600m of visibility Target Run Time (hrs): 40 steady, 70 strobe flash Requires 2 CR2032 coincell batteries (included) Stretchy silicone straps let fun flexy Frogs mount almost anywhere Stretchy silicone straps let fun flexy Frogs mount almost anywhere Stretchy silicone straps let fun flexy Frogs mount almost anywhere Stretchy silicone straps let fun flexy Frogs mount almost anywhere Stretchy silicone straps let fun flexy Frogs mount almost anywhere