U.S. troops getting wearable gunshot detectors | Crave - CNET

U.S. troops getting wearable gunshot detectors | Crave - CNET: "Weighing less than 2 pounds, the IGD picks up supersonic waves produced by the blast and whiz of rounds and indicates where they're coming from in a fraction of a second.
An earpiece that was developed for the system provides audio warnings such as 'Shot, 400 meters, 3 o'clock.' It tracks the shooter and continues to provide audio updates."