Ultra lightweight and compact. Ambidextrous momentary/steady On-Off switch. One handed snap-on and tighten interface keeps hands away from muzzle when attaching/detaching. Securely fits a broad range of weapons using key kit provided (key kit not provided with H&K USP models). Windage and Elevation adjustment screws mounted in brass bushings for long life and dependable zero retention of laser. Operating temperature: -10°F to +120°F. IPX4 rated design; water resistant operation. Serialized for positive identification.