Expansion Microphone Kit for Poly Trio 8300/8500/8800 (qty 2) – Global Communication
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 2200-65790-001 Expansion Microphone Kit for Trio 8800 and 8500 at Lowes.com