This is the built-in stereo microphone <L>/<R>.
Front tally lamp
Illuminates when the recording is started. Flashes when the battery level becomes low.
Whether or not to illuminate the lamp can be set in the menu.
Fan outlet for cooling fan. Do not block this while the camera is being used.
<AWB>/<USER 7> button
Adjusts the white balance. Press it for two seconds or more to adjust the white balance and then black balance.
This is also used as the USER button (USER7).