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 Trio Expansion Microphones for Trio 8300, 8500 & 8800
Polycom SoundStation 2W EX Expansion Mics (2200-07840-001) | Comtalk Inc.
NEW Polycom SoundStation EX External Microphones 2201-00698-001 | eBay
Polycom 2200-40040-001 SoundStation IP 7000 Microphones