Cygolite Ranger Endurance Edition. Features: A super compact light great for both mountain and road which claims to have the best battery life on a bike light with this many lumens Fully loaded with ultra high capacity cells, advanced microcontrollers, and powerful LEDs for unprecedented battery life engineered to go the extreme distance Cycling Tuned Optics throws a long range, extra wide beam to cover road and mountain biking 9 lighting modes: boost, high, medium, low, SteadyPulse, triple flash, day flash, walking, and zoom Two button design allows scrolling through modes and adjusting brightness in each setting Features a light lock to prevent the unit from turning on while stored Includes a hard clamp handlebar mount with quick release that secures the light, headlight, and micro USB cable Designed, engineered, and assembled in the USA Specs: Model Package:Ranger 2000 Endurance Edition Lumens:2000 Run Time:up to 110 hrs Color:black Weight:252g