The TLR-7 X sub features multi-fuel battery capability powered by either one (1) CR123A or one (1)Streamlight SL-B9 lithium-ion rechargeable battery pack, both delivering 500 lumens and 5,000 candela. The integrated rail clamp is designed to rapidly attach/detach from the side of the weapon, providing smooth installation and removal without having to put your hands in front of the muzzle.