Kryptonite Incite X6 / XBR headlight and taillight set takes safety and visibility to new heights. The Incite X6 features an auto light sensor mode that measures ambient brightness and adjusts the light mode automatically. 6 additional modes including steady, flash and pulse modes provide 3-30 hours of battery life before needing recharging via USB. The XBR taillight uses a built-in accelerometer to provide a brake light which increases output 3x over the steady mode. 7 Modes including a daytime brake mode for 10-36 hours of runtime before needing a recharge via USB.