The Spracht CP-2018 Aura SoHo Plus Conference Phone has a total of five microphones; 3 built-in mics provide 360? coverage for a 20? X 20? room, Plus 2 external mics for larger room coverage. Plus, including a Accessory bay for optional modules, Bluetooth®, PBX. The ConferenceNow? unique one touch conference button on the Spracht CP-2018 Aura SoHo Plus Conference Phone is perfect for quick access to conference calls.