Mostly use for calls, sometimes for music. Works well for calls in the car, in the office and outdoors. Excellent ambient sound isolation. Excellent incoming sound. Excellent outgoing sound, when microphone is raised towards the mouth. Only problem I face is that the microphone hangs low, I have to raise it towards the mouth when speaking. I end up tying the cord to the top button of my shirt to keep the microphone close when speaking then it works very well. Inclusion of a small clip in the package would have helped a lot. However with the microphone raised, the cord length from microphone to phone connector becomes short. The shortcoming due to microphone placement and cord length prevents me from giving five stars. http://garyadair.com/923053