Headphones. For many years I had pretty much used headphones that came with the detector, THEN, one day I bought a pair of "Grey Ghost", based on other guys use and comments, and of course the infro. of the add"s themselves. Well, I bought another pair for another detector. Night and day difference, between what is included with a detector buy, and what you can order otherwise. Not saying Gray Ghost is BETTER than any other brand, but I am really happy with them. It's nice when you call it right every so often.