Streamlight's high flux LED light with Proprietary Micro Optical Systems has Battery-Booster electronics to provide a super-bright beam. Features Proprietary Micro Optical System MOS , for optimized output and runtime Super-bright 1/2 watt, 30,000 hour high flux LED An internal polymer body liner and shock proof switch housing allow for operation under the most extreme conditions Rubber push button tail cap switch O-ring sealed Unbreakable polycarbonate lens Corrosion and water proof construction Type II MIL-SPEC abrasion and corrosion-resistant anodized aircraft aluminum Shock-proof drop test verified above the industry standard of six feet Unbreakable pocket clip Key ring and safety lanyard included Includes One AAA Alkaline Battery Specifications Lumens 35 Beam Distance 41 Meter candela 420 Run Time 2 1/4 Hours Color- Matte Black Streamlight MicroStream; Black MicroStream Black