Amazon.co.jp: SoundStation2 EX (Expansion Microphone Compatible with Model) Ppss – 2 : Musical Instruments
Set of 2 Polycom SoundStation 2W Extended Microphone 2201-67840-101 | 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