35 Lumens provide visibility from over 900m day or night. Wide visibility angle intended for city use. Two day-time visibility modes and two night modes. Day flash 35LM-8hrs, night flash 35LM-16hrs, day steady 20LM-3hrs, night steady 2LM-20hrs. Integrated light sensor for auto-brightness control. Battery save mode at 5% life helps ensure a safe ride home with depleted battery. Quick connect bracket with 16 degree offset compensates for seatpost angle. Includes Quick connect bracket and micro USB charging cable.