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: TNP 2.5mm Extension Cable (6 Feet) - Male to Female Adapter Extender Stereo Audio Sub Mini Subminiature Jack Adapter Wire Cord Plug Connector for Headset Headphone Microphone : Electronics
Poly HDX Ceiling Microphone - "Extension" Kit - microphone - 2200-23810-002 - Video Conference Systems - CDW.com