Polycom SoundStation2 is ideal for small and midsize conference rooms seating up to 10 participants. It delivers exceptional performance and voice quality, making your conference calls clearer and more productive. SoundStation2 also provides natural, simultaneous, two-way conversation without the clipping or drop-outs that are common in traditional speakerphones. Users can speak in a normal voice and be heard clearly up to ten feet (3-meters) away.For crystal-clear conferencing, Dynamic Noise Reduction (DNR) actively removes background noise such as projectors and ventilation systems360-degree microphone coverage with intelligent mixing highlights the person speaking, not the distracting ambient soundsNo more buzz technology resists interference from mobile phones and other wireless devices, delivering clear communications without distractions. POE (Power Over Ethernet) Non-expandable, not compatible with expansion microphones.