Lot 2 Polycom Trio 8800 2201-69085-001 Expansion Microphone for RealPresence | eBay
Expansion Microphones - Increase the audio coverage of your conference room by pairing the Expansion Microphone with your SoundStation conference phone. | Poly, formerly Plantronics & Polycom
Amazon.com : Polycom Realpresence Trio 8800 External Microphones - Black (Pack of 2) : Office Products
Poly Expansion Microphone Kit for RPTrio 8800 (2200-65790-001)