Unfortunately, I've had the connectivity issue that the others described as well. The right earbud, and sometimes the left, doesn't work when I get to the gym to use. Therefore I'm always having to take my case with me and, forget device - recconnect to bluetooth. Its a major pain. I sent them back to Apple and they sent back saying nothing was wrong with them. I'm going to file another claim because its still doing it and has done this since day 1. Way too expensive to have this issue ongoing.