ClearOne 910-156-250 Chat 170 Personal/Group Speakerphone Full-Duplex audio performance allows users to listen and speak at the same time without audio cutting in and out Distributed echo cancellation identifies and eliminates acoustic echo Noise cancellation samples the ambient room noise and cancels it out for more natural sounding conversations First microphone priority intelligently changes microphone levels depending on who is doing the talking.Coverage Area: 360-degree up to 8ft Automatic Gain and level controls adjust microphone and speaker levels automatically