A combination of two tactical tools in one unit, the Crimson Trace Rail Master Pro Laser Sight & Tactical Light Combo- Universal Green Laser is made to fit modern pistols, rifles, and shotguns that are equipped with a Weaver or Picatinny rail. The laser light is complimented by a powerful flashlight for illumination.The powerful green laser of this unit can operate for up to an hour on its lithium battery, and it has three operational modes. It can be used in laser light/light constant on, laser constant on, and light constant on modes, and the choice is all yours. It also features an auto shutoff to conserve the life of the battery. The aluminum body is designed to be waterproof.