Rear light with seven super bright red LEDs for maximum visibility. Custom lens optics increase the distance from which the light is visible. Uses a patented flashing rate that has been scientifically proven to be more visible to the human eye at a distance. Premium quality LEDs are more efficient, resulting in more light output, longer run times, and longer lifespan. Side LEDs provide 180 degrees of safety boosting light output. Water-resistant case helps protect the batteries and electronics inside. Tough rubber moulding for durability, knock resistance and added protection. 150 hour run time on flashing mode. Bike mount included, and an integral clip allows light to be fitted to bags and clothing. Requires 2 x AAA batteries (included). Blackburn no-quibble lifetime warranty