Virtually indestructible LED emitter, microprocessor regulated to maximize output and runtime User-programmable tailcap and head switches provide three light output levels plus high-intensity tactical strobe Dual fuel capable—uses one lithium-ion rechargeable battery (included) or two disposable or rechargeable 123A cells Coated, tempered window resists impact and thermal shock, maximizes light transmission Precision micro-textured reflector creates smooth, optimized beam High-strength aerospace aluminum body, Mil-Spec hard-anodized for extreme durability Fuel gauge indicates remaining battery power O-ring and gasket sealed to keep out dust and moisture Wall (AC) charger with international adapters and car (DC) charger included