Polycom Debut Microphone 

The Polycom RealPresence Debut Expansion Microphone is an accessory for the Polycom RealPresence Debut all-in-one video conferencing system. Expand the range of your Polycom Debut deployment with this three-microphone array that gives you 360° coverage. The microphone gives you HD audio in a simple to use package. Simply plug it into the RJ11 slot on the Debut main unit, and your audio is that much better.
Included with the Polycom Debut Expansion Microphone:
Polycom RealPresence Debut expansion microphone 25 ft cable