Powerful output through a combination of focussed and wide lenses simultaneously highlighting the edge of the trail without compromising the far-reaching beam, perfect for aggressive riding on singletrack and technical terrain.Reflex++ Technology will automatically boost lights to the highest lumen outputs at high speeds and dim for the climbsOptimized Mode Selector provides multiple programs for choice of run times and modes so you can find the right one for your ride2-36 hr run time