Polycom SoundStation 2 EX with 2 Mics Included (2200-16200-001)+(2200-16155-001) For a crystal-clear phone conference, Dynamic Noise Reduction (DNR) actively removes background noise such as projectors and ventilation systems 360-degree microphone coverage with intelligent mixing highlights the person speaking, not the distracting ambient sounds No more buzz technology resists interference from mobile phones and other wireless devices, improving communication in the workplace, with no distractions 2x Extension Microphones for Increased Range Included