Question: Why do serious metal detectorists use headphones?
Answer: Headphones can greatly reduce outside noise. They also enhance the audio target signal, which will help you determine which targets to dig and which targets to ignore. Overall, a good set of headphones will improve the number of your good finds and greatly reduce the time you spend digging trash. Headphones also reduce distractions, extend battery life and keep you from attracting unwanted attention from curious onlookers.