Serfas True 2500 USB Headlight Produces over 2500 lumens of Pure light Ramp air cooling for increased brightness, burn Time and longer LED lifespan Includes Wired remote switch, extension cable, handlebar mount, helmet mount and ballistic nylon storage case Weighs just 540 grams with battery 5 modes with varied Run times. 1.75 hours burn Time in overdrive (2500 Lumen output) Produces over 2500 Lumens of pure light Ram Air Cooling for increased brightness, burn time and longer LED lifespan Includes wired remote switch, extension cable, handlebar mount, helmet mount and ballistic nylon storage case Weighs just 540 grams with battery 5 modes with varied run times. 1.75 hours burn time in Overdrive (2500 lumen output)