Includes: Rechargable 18650 battery The Monstrum 2400 Lumen Arcsaber Flashlight is the newest in our family of best-selling tactical flashlights. At 2400 Lumens, the light is powerful enough for outdoor environments as well as for home defense weapons. Designed specifically for use with rifles or shotguns, the flashlight mounts securely to M-LOK or Picatinny rail systems based on selection.