- Kirjeldus: The SIGMA SPORT rear light features not only a brake light function, but also two flashing modes, making it even more visible on-road and off. The integrated brightness sensor automatically activates the bike light when visibility conditions are poor. 500 metres of visibility range, 50 hours of burn time, cost-effective, multifaceted, and user-friendly: the BLAZE FLASH is a true all-rounder for any seat post!