Cat Eye LD270 Taillights feature 3 LEDs that last up to 60 hours of run time on constant mode or 180 on flashing mode.Up to 180 hours of run time; 60 hours of run time in constant modeIncludes batteriesIncludes Flex-Tight bracket that fit up to 32mm diameter seatpostsItem SpecificationsWeight46gBattery2 NBulb3 LEDRun Time60/180