GN NETCOM 2303-820-105 Jabra BIZ 2300 Landline Telephone Accessory Air Shock Microphone -When the microphone is close to the mouth of the user, there is a risk of respiratory noise. To reduce it, the microphone is designed aerodynamically, and with many small holes instead of a larger hole With Jabra's Spin boom you can rotate your boom a full 360 degrees. This lets you adjust your boom positioning so that it's always exactly where they need it - without having to worry about breaking it HD Voice - High quality audio for crystal clear conversations Enjoy high-definition sound with HD Voice and get crystal clear, intelligible communication Bottom cord is NOT included