The HellFighter™ X-21 Tactical light is one of the most advanced weapon mountable entry lights on the market today. Its shock isolated bulb can endure the pounding of large caliber automatic weapons fire. With an astonishing output of 450 lumens, they are the brightest 7.4 volt weapon lights in the world. Constructed of the world"s toughest materials and tested in the battle of Baghdad and south-central Los Angeles, the HellFighters have the proven reliability required for lethal environments. The Interrogator™ impact bezel is made from 6160 through hardened aluminum. Powered by (2) 3.7v Rechargeable batteries – included.