Listen to your favorite MP3 in stereo! Experience improved sound clarity - even in noisy environments - with the acoustically tuned speaker. And dont worry about getting caught up in the music; the headset automatically mutes for an incoming call and resumes playing when the call has ended. Send/End key on headset allows users to place, receive and end calls without touching the phone. Simply press the button on the headset and start talking. Ideal for private hands-free operation.