- ClearOne MAX EX full-duplex conference phone- Expand up to four phones- Unbelievable clarity- Easy to use - plug it in and talk- Automatic level control adjusts microphone volume levels based on how loudly participants in the local room are talking to improve voice quality for far-end participants- Automatic gain control adjusts loudspeaker volume based on the incoming audio signal from the far end to provide clear, intelligible audio in the local roomCO910158500