Specifications Output / Runtime HighSetting 100 .0 lumens / 6.0 hours Low Setting 1 .0 lumens / 144.0 hours Weight w/Batteries 9 .4 ounces Batteries 3 2 123A (included) AA alkaline (optional; not included) Features Virtually indestructible LED emitter regulated to maximize output and runtime Proprietary refractive optic produces a smooth, wide beam optimized for your field of vision Variable light-output dial controls levels from 0 to 100 lumens High-strength aerospace aluminum body, Mil-Spec h