The Specialized Flux 900 Headlight lets you see what youve been. It uses two different LEDs under dedicated optics, which combine to make the perfect beam of light to see both far & wide. With output from 300 to 900 lumens & run-times of up to 30 hours this light is powerful enough to use on night-time training rides both on & off-road & will see you through the darkest commutes. The Flux 900 also comes with a Daytime Flash mode so it can be used on all types of rides. Features Sculpted beam pattern puts light where you need it & maximizes every lumen. Combining narrow & wide optics puts light where you need it, at any speed. Quick release bar mount works on bars from 25.4 to 31.8mm Mounting system centres light in front, above, or below the stem with a long reach to work around most computer mounts & shifter/brake cables Wide side lights to give you 180-degree visibility to other cyclists & motorists. USB (Universal Serial Bus) rechargeable 3350m Ah Li-Ion internal battery. 300 to 900 Lumens LED output. 1.5- to 30-hour runtimes 90% fast charge in 1.5 hours with full charge in 3 hours Three operating modes: Steady High Mode, 900 Lumens Steady Low Mode, 300 Lumens Steady/ Flash Mode, 300 Lumens Daytime Flash Mode, 300 Lumens