The NiteriderA(R) Sentry(TM) Aero 260 keeps guard both night and day with an aerodynamic shape that gives cyclists 260 degrees of visibility with a matching 260 lumens of light output featuring Optimal VIZ Daylight Visible Flash (DVF) technology. It&';s lightweight form factor (65g) and ability to fit standard to aero seat posts makes this light the perfect choice for Tri-Athletes and Road Bikers alike. FEATURES a Lumen Output: 260 a 6 Modes with Run Times: 4:30 - 30:00hrs a Charge Time: 2:30hrs a Weight: 65g a Battery: Li-Po a Low Battery Indicator a 260 lumen super bright taillight a Water / Dust Resistant IP64 Rated RUN TIMES a Fast Flash - 7:00h a Steady w/ Fast Flash - 6:30h a Alternating Flash - 7:30h a Pulse Flash - 6:00h a Steady High - 4:30h a Steady Low - 30:00h