Features two lighting modes: Constant on and easy to use THRO (Temporarily Heightened Regulated Output) mode for maximum brightness; 300 lumens; 69m beam; runs 3 hours and THRO: 1,000 lumens; 110m beam for a 35 second burst Thin, ergonomic design fits comfortably in your hand and provides clean pocket carry; includes deep carry pocket clip that attaches to either side