High-performance LED is regulated to maximize tactical-level output and runtime per set of batteries TIR lens creates focused high-intensity beam for close- to longer-range applications Integral aluminum T-slot mounting system offers rock-solid attachment to railed hand guns and long guns equipped with MIL-STD 1913 rails Weatherproof O-ring and gasket sealed High-strength aerospace aluminum with Mil-Spec anodizing; coated, tempered window Accepts optional DG pistol grip and XT remote long gun tape switches Includes high-energy 123A batteries with 10-year shelf life