The SureFire XH15 Weapon Light is designed to work in conjunction with the Surefire MASTERFIRE rapid deploy holster (RDH). The light activates automatically when the paddle switch is swept past an embedded actuator within the MASTERFIRE RDH. Custom MaxVision Beam reflector creates a smooth, broad beam with ample light volume Integral ambidextrous constant-on switching Attaches securely to both Universal and Picatinny rails High-strength fiber reinforced polymer body, and aerospace aluminum body, Mil-Spec hard anodized LED head assembly for extreme durability A virtually indestructible, digitally regulated LED delivers 350 lumens of Mfg: Surefire