Be seen day or night while you ride with the LUCIA Intelligent Bike Tail Light. Designed with the modern cyclist in mind, this innovative light is loaded with smart features. Thanks to the advanced triaxial accelerate sensor, LUCIA automatically triggers a stop light when you brake. This instantly alerts drivers, pedestrians, and other cyclists around you. In addition, it has a built-in sensor to detect environmental brightness and adjust itself automatically. Offering a 180-degree field of view, you get full visibility up to 1 kilometer. Fitting right on your seat rail, this aerodynamic bike light even senses when you set off and detects when you take a break. With this, it automatically turns on and off to preserve battery life. Incredibly, it can even detect when you’re on a poorly lit road to automatically turn on. Weatherproof for any and every weather condition you find yourself in, LUCIA remains lightweight at just 39 grams. And, impressively, the battery provides up to 24 hours of run time on night-detection mode.