Has “y” split spaghetti cord so you can switch mike from radio to intercom. Not much nomenclature on these but they do come new in box, never used, but have no way to check and see if they work now. The foam insulation is starting to deteriorate, and will more than likely need to be replaced. It is starting to get just a little oily and gummy as is typical with age. These have 1990 dated on the outside package label. Coming down to the end of these, buy while you can!