Features our Wide Angle Optics lens that provides up to 270í of visibility and an innovative automatic braking sensor When decelerating, the light will turn solid like a brake light and then provide a distinct flash pattern once stopped to alert riders or vehicles from behind, then change back to its previous output mode once the rider resumes his or her ride Co-molded construction is super compact, highly water resistant, and boasts five LEDs for up to 175 lumens of output With 11 output modes, including a Daytime Flash mode, itís got options for any time day or night Compatible with standard and aero seatposts