Muting the handheld transmitter (AF mute)
You can mute the audio signal by pressing the MIC button.
To do this, the MIC button function must be configured to AF On/Off. You can find more information about this subject under Advanced > Mute Mode menu item.

Furthermore, you can configure whether the MIC button should light up red and when. You can find more information about this subject under Advanced > MIC LED menu item.