Steiner eOptics Mk5 Battle Handheld White Light LED Illuminates to 500 meters, making the Mk5 one of the brightest pocket-sized, weapon-mountable flashlights available today Hand-held or weapon-mounted with optional accessories Momentary / Constant On Output: 800 lumens with 2 CR 123A / 650 lumens with 1 Submersible to 5 meters