Expansion Microphones - Increase the audio coverage of your conference room by pairing the Expansion Microphone with your SoundStation conference phone. | Poly, formerly Plantronics & Polycom
Polycom RealPresence Trio 8800 With Expansion Mics - 323.tv
Polycom SoundStation IP 6000 Expansion Microphones (2215-07155-001)
Logitech Expansion Mic for GROUP System – Global Communication