- For use with Polycom SoundStation2 Conference Phone. Expandable, WITH Display. - 50% more microphone sensitivity allows you to speak in a normal voice and be heard clearly up to 3m away from the microphones. Eliminates ear strain and repetition. - Dynamic Noise Reduction is designed to minimize distracting room and background noise. - Intelligent microphone mixing allows only the microphone closest to the person speaking to be on for crystal clear conferencing. - For use with Polycom SoundStation2 Conference Phone. Expandable, WITH Display.