Radiance Technologies, a small Huntsville, AL company, has created a system that can instantly determine the exact location of a gun being fired and its model. The U.S. Army is currently testing it and three similar ones to give soldiers an edge in battle conditions, by allowing them to return fire more rapidly.

Unlike other known systems, the Radiance’s WeaponWatch is powered by infrared sensors that can literally detect missiles or gunfire at the speed of light. It even works while under heavy attack and at longer sniper distances.

WeaponWatch is one of the major reasons Radiance has grown from only three employees six years ago to 275, making it one of the 500 fastest-growing small businesses in the United States.