Include more people on your web conference calls with the MXL AC-40EXT microphone. Connect up to three of these extension mics to either the AC-400 or AC-406 central USB mic. Each AC-40EXT has its own mute switch to enable private conversations. The sturdy metal construction makes the AC-40EXT perfect for an office environment or conference room. Conduct meetings over the web with superior clarity, even with multiple participants. A 6 ft. cable is included to attach the AC-40EXT to either the AC-400 or AC-406 (required to operate AC-40EXT).