Features: Rear light offers ten LEDs and a maximum output of 400 lumens Engineered for increased efficiency and runtime, providing the best beam pattern for optimal light dispersion in the most challenging conditions 80-hour max runtime provides a long battery life Tested to IPX7 waterproofing standards to withstand harsh environments Seven output modes let you customize your lighting experience Wide-angle optics provide 270deg visibility USB-C waterproof charging (cable not included) Versatile mounting system attaches to aero or round seat posts