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
Expansion Mics for Polycom Trio 8500 & Trio 8800 – Pair | Business Telecom Products