This is copied right from the full manual. This surprised me:
Earpiece and Sub-microphone: Listen to callers. In Speakerphone mode, captures your voice. While recording video, captures audio. Avoid covering the sub-microphone during Speakerphone mode or when recording video.
This is on page 15 in the full manual. The arrow points right to the earpiece!
Earpiece and Sub-microphone: Listen to callers. In Speakerphone mode, captures your voice. While recording video, captures audio. Avoid covering the sub-microphone during Speakerphone mode or when recording video.
This is on page 15 in the full manual. The arrow points right to the earpiece!