Here’s a concept watch and rings that can save your life from various different life situations. (Hey, can they detect police too?)
The wristwatch aspect, identifies the sound wave and present this info to the wearer in an easy to read display. The watch is programmed to listen for certain key phrases from humans like “Excuse Me..”, your name being called and any number of car noises including the most important one, a car’s horn. This device concept could not just be a major life enhancer for the deaf, it would most certainly save lives.