Monaural headset features a robust noise-canceling microphone that filters 90 percent of background noise to ensure your voice is all that's heard. Broadband audio frequency also helps to make your voice sound more natural. The microphone boom rotates 300 degrees so you can wear the headset on either ear. And the microphone automatically mutes when the boom rotates 60 degrees up or down. Comfortable leather and foam ear cushion provide an enjoyable fit through your entire day. Headset is designed for phones with a RJ-9 headset port (sold separately).