Amazon.com : Polycom Realpresence Trio 8800 External Microphones - Black (Pack of 2) : Office Products
Polycom IP 7000 Exp Mics - VoIP Supply
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 IP 7000 External Microphones (2200-40040-001) - Shop4Tele