High and low modes: High super-bright light: 500 lumens; 167m beam; runs 2.5 hours (CR123A batteries); runs 3.75 hours (SL-B26 battery pack), Low for extended run time: 85 lumens; 64m beam; runs 12 hours (CR123A batteries); runs 19 hours (SL-B26 battery pack)MULTI-FUEL: Uses two CR123A lithium batteries; also accepts Streamlight SL-B26™ protected Li-Ion USB rechargeable battery packMulti-function push-button head switch easy to use with gloved hands; features battery life indicatorMulti-position, reversible pocket clip attaches to MOLLE, turnout gear, harnesses, etc.; offers a variety of mounting positionsIntegrated carabiner style D-ring for a variety of attachment methodsOptional Gear Keeper® system for attaching the light to turnout gear or other clothing or equipmentGear Keeper features a retractable attachment system with a high-strength nylon tether with a 36" extension and 6 oz. of retraction forceHigh-impact, super-tough nylon polymer with textured gripMeets requirements of NFPA 1971-8.6 (2013)