Polycom SoundStation 2 Non Expandable Analog Conference Phone (2200-16000-001) Large LCD Display, Polycom Acoustic Clarity technology for remarkable voice quality Ten feet (3-meters) of 360-degree microphone pickup range ideal for small and medium-sized conference rooms Resistance to interference from mobile phones, Easy installation and use from standard telephone lines Applications port, which connects to mobile phones for dialing from rooms without an analog phone line Connect to PC for internet calling, POE (Power Over Ethernet) Non-Expandable Ability to increase microphone pickup  Optional extension microphones expand coverage for larger conference rooms Connect to mobile phones