The Kryptonite 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.
Acceleration sensor: when speed is reduced by more than 1.6 m/s, (5.76 km/hr or 3.58 mph) an additional LED is switched on
Low battery indicator displays red if battery capacity under 25%
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.