Digital SmartMixer, On board acoustic echo cancelling (AEC) processing, Full digital processing on inputs and outputs, 4 balanced mic inputs, 2 balanced Mic/Line inputs,1 stereo unbalanced input, 1 stereo and 2 mono outputs, 2-channel USB audio interface for soft codec (Skype, WebEx) integration, Up to 6 mixers can be linked using Cat5e cable