The Countryman Isomax 4RF Gooseneck Microphone improves on a standard that can be found in many boardrooms, schools, courtrooms, meeting halls, etc.The gooseneck microphone is designed to capture vocals with great clarity and detail while effectively rejecting nearby radio frequency (RF) interference from cell phones, computers and other electrical sources. Active Vibration Isolation uses a separate element to sense noise caused by vibration and shock and eliminates the noise on output.