Cygolite Ranger Endurance Edition bicycle headlights. Built for century ride longevity on the road and through deep trail exploration, they are fully loaded with ultra high capacity cells, advanced microcontrollers, and powerful LEDs for unprecedented battery life engineered to go the extreme distance.Supercharged 1:30 to 110 hour run timeExtremely powerful 2,000 lumensBattery: 1, 18650 Lithium Ion, 3.7(V), 25.16(Wh), 99g, IncludedCycling Tuned Optics throws a long range, extra wide beam to cover road and mountain bikingDaytime visible flashes make you stand out on busy streetsTwo-button design lets you fine tune the brightness and flash speeds to your cycling needsSteadyPulse mode alerts motorists with attention grabbing pulses while its overlapping steady beam constantly lights your way at nightDayLightning flash mode bursts lightning-like flashes to make you stand out in broad daylight on busy streetsHard clamp handlebar mount with quick release secures the light in tough terrainLight Lock Mode lets you disable the light for transport or storageItem SpecificationsBatteryLi IonLumens Front2000Recharge TypeUSBWeight252 CygoLite Ranger Endurance Headlight Headlight, Rechargeable UPC: 745025027051