The MX-P2 has a built in microphone for audio recording and streaming. In some situations you may need to disabled the microphone.
Disabling the microphone is only for setups with the MX-P2 connected to a computer with USB.
To disable the microphone hold down the Brightness Down and Zoom Out buttons on the ELMO for 3 seconds. The camera must be powered on for the change to take effect.