The Flare R City tail light is daytime visible and designed for the city. A wide beam spread, focused optics, and an interruptive flash pattern make it visible from over 400m during the day. A built in ambient light sensor provides auto-brightness control, and the included Quick Connect bracket offers simple removal for recharging via the included USB cable.35 Lumens of power and the wide visibility angle of the Flare R City tail light make you the biggest distraction on the city streets, day or night.Key features35 Lumens provide visibility from over 400m day or nightWide visibility angle intended for city useTwo day-time visibility modes and two night modesDay flash 35LM-8hrs, night flash 35LM-16hrs, day steady 20LM-3hrs, night steady 2LM-20hrsIntegrated light sensor for auto-brightness controlBattery save mode at 5% life helps ensure a safe ride home with depleted batteryQuick connect bracket with 16 degree offset compensates for seatpost angleIncludes Quick connect bracket and micro USB charging cable