Specialized Flux Expert Rear Light

Be seen, either in the day or at night, with the super-powerful Flux Expert tail light. The flashing mode automatically boosts the light's output to 110 lumens during the day for up to 14 hours, while making you visible up to a two thirds-of-a-mile (or one kilometer) in full daylight.

Maximum safety, even in the brightest conditions.
110 lumens output sets new benchmark.
Visible up to 0.6 mile/1.0 kilometer during midday in the summer.
Patent-pending reflector mounting system for perfect aim on 27.2, 30.9mm, and Venge seatposts.
Ambient light sensor boosts light output by 50% while in Flash Mode during daytime running, for increased visibility.
Integrated, flip-out USB tab to charge rechargeable Li-Ion battery in any USB port in under 90 minutes.
All the aesthetics and performance to match the fastest road race, adventure, and commuting bikes.
Three operating modes:

Steady, 25 Lumens Surge, 5-55 Lumens Flash, 55-110 Lumens