Remarkable Voice Quality. The New Standard for Everyday Conferencing. The SoundStation2, Polycom's next generation conference phone redefines the standard for business quality voice conferencing. With industry-leading full duplex for natural, simultaneous two-way conversation, the SoundStation2 will exceed your expectations in medium to small conference rooms. You'll also enjoy new features, including a large back-lit display that offers easily visible call information and telephone functions. Smart technology, such as Dynamic Noise Reduction (DNR), provides maximum microphone sensitivity, while reducing distracting room and background noise. And the SoundStation2 offers 360-degree microphone coverage with intelligent mixing - so only the microphone closest to the speaker is on for crystal clear conferencing. Add traditional telephone features like redial, mute, transfer, and hold and you have a conference phone that's also familiar and easy to use. Note: The POLY-16155 (EX Extension Microphone Kit) is for use with the POLY-1620 (Expandable Conference Phone). The POLY-16155 will not work with the POLY-1600.