Amazon.com : Polycom Expansion Mics for SoundStation IP 6000 (2215-07155-001) : Audio Conferencing Equipment : Office Products
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 SoundStation IP 7000 Expansion Microphones, 2200-40040-001
Polycom RealPresence Trio 8800 With Expansion Mics - 323.tv
Logitech 989000171 Group Expansion Microphones for Video and Audio Conferencing for sale online | eBay
Expansion Microphone Set for Polycom SoundStation VTX 1000/IP 6000 - 323.tv
Amazon.com : Poly Polycom Expansion Mic for RealPresence Debut (2200-69631-001) : Office Products
Polycom Soundstation 2 EX w/ 2 x Extension Microphones, For Audio Conference