Polycom 2200-07840-001 SoundStation 2W EX Extension Microphones (Refurbished)Expand your SoundStation2W EX's sound coverage! Add these 2 extension microphones to your Polycom SoundStation2W EX wireless conference phone to ensure superior sound quality during your conference. You'll increase your audio range, especially in larger conference rooms, so all participants sound crisp and clear! Key Features: Mnfr. Part #: 2200 07840 001 Extend Up To 6' On Either Side Of Base Unit Increases Audio Conference Participants From 15 To Up