The TWM-850XLS Xtreme Lumens Tactical Weapon-Mounted Light uses a CREE LED rated 850 lumens working in conjunction with a high-efficiency deep parabolic reflector to create a usable beam of light rated at 245 meters. This weapon light features a glass-filled nylon polymer ambidextrous toggle switch on each side of the light to operate the momentary-on and constant-on and strobe lighting modes. The flashlight is waterproof, impact resistant, chemical resistant and is serialized for personal identification. Includes 4 Sets of Cross-Rail Inserts (2 inserts each to fit GLOCK, 1913, TSW/99, 90two), 4 Cross-Rail Mounting Cap Head Screws, Allen Wrench, and 2 CR123 Lithium batteries.