Non-functional right out of the package (which took a couple of weeks to reach me). I'd previously tried an Andrea Electronics NC-181 Over the Head Headset which worked pretty well (except for getting the microphone position adjusted so listeners didn't hear my breathing) but I was looking for a less expensive option. You get what you pay for. I'll be returning these to Amazon. And, if I need this functionality again, I'll stick with a well-rated headset.