I have had three of these ear pieces. It fits my ear well, is comfortable for long conversations (up to an hour or two), and stays put on my ear without hassle.The first one I had worked excellently for years before I got rid of it when I got rid of my cell phone. When I got a cell phone again, I knew exactly what I wanted. The second was just as great as the first, but unfortunately was stolen.The third didn't work. Booo. I could hear the person on the other end of the phone, but they could not hear me. I tried it on several different phones with the same result. Didn't work.I returned the ear piece and the seller was prompt and courteous. Too bad I got a defective item. But I guess that's how it goes with consumer electronics. I wouldn't let it stop me from ordering this again, though. Just make sure you get it from a decent seller who will accept a return if it doesn't work.