Unique clamp design allows Windage and Elevation screws to be in the proper orientation for laser sighting in any mounted position – One handed on/off & tighten interface keeps hands away from muzzle when attaching/detaching – Mounts directly to guns with MIL-STD-1913 (Picatinny) rails – Extensively live-fire tested impact resistant construction – C4 LED technology for extreme brightness – Momentary/steady On-Off switches – Operating temperature: -20°F to +120°F – IPX4 rated with the Standard two button switch – Serialized for positive identification. – The Streamlight ProTac Rail Mount HL-X Weapon Light is a unique Gun-Mounted Tactical Light with a combination of features. Integrating an aiming laser with the white LED illuminator it represents the latest in close combat/defense illumination technology for rifles carbines and submachine guns. It also incorporates the Streamlight Rechargeable 18650 battery. The light provides 1 hour 30 minutes of continuous run time on high and over 20 hours on low intensity. Rail clamp designed to rapidly and securely attach/detach from any weapon with a MIL Standard 1913 Rail. Perfect for law enforcement security military and self-defense applications.