Built for century ride longevity on the road and through deep trail exploration the 1 800 lumen Ranger Endurance Edition is packed with ultra high capacity cells advanced microcontrollers and powerful LEDs for unprecedented battery life engineered to go the extreme distance. The 2-button interface lets you fine tune the brightness and flash speed with patented built-in OSP Technology.- Experience the best battery life ever on the most powerful bicycle light series of its kind- Supercharged 1:15 to 110 hour run time- Default brightness settings can be fine tuned for longer run times- Extremely powerful 1 800 lumens in the most compact and stylish form- Cycling Tuned Optics throws a long range extra wide beam to cover road and mountain biking- Daytime visible flashes make you stand out on busy streets- Patented built-in OSP (On-Site Programmable) Technology with two-button design lets you fine tune brightness and flash speeds to your cycling needs- Top button fine tunes brightness of brightness modes and flash speeds for flashing modes- Bottom button scrolls through the different lighting modes- Expand run times beyond factory default settings by fine tuning the brightness modes and flash speeds- 9 lighting modes for day and night use (Boost - High - Medium - Low - SteadyPulse - DayLightning - Triple Flash - Zoom - Walking Mode)- SteadyPulse mode alerts motorists with attention grabbing pulses while its overlapping steady beam constantly lights your way at night- DayLightning flash mode bursts lightning-like flashes to make you stand out in broad daylight on busy streets- Hard clamp handlebar mount with quick release seHelps Supports the light in tough terrain- Light Lock Mode lets you disable the light for transport or storage- Durable compact size weighs only 244 grams- IP67 water resistant for use in all weather conditions- USB rechargeable 5 hour charge time- Light mode memory saves the mode youre in before light is turned off- Low battery indicator alerts you when a charge is needed