250 Analog Conference Phone- OmniSound 2.0 - sensational sound- Full duplex eliminates talker echo and allows two-way conversation- Noise reduction technology to reduce the background noise- A highly-sensitive 360-degree microphone captures the voices of all the speakers present to provide even sound distribution in the room- Three loudspeakers for enhanced sound diffusion in the room- Expansion microphone capabilities (Part Number 900102113)- An equalizer enables you to adjust the sound Reception Area: up