When the sound-activated speaker is on, the speaker only transmits sounds that exceed a certain level. You can adjust the VOX sensitivity. The higher the sensitivity level, the more sensitive the camera is in detecting sounds for transmitting to the parent unit.
1. Press 
when the parent unit is idle.
2. Press 
,
, 
or 
to choose 
, and then press 
.
3. Press 
or 
to choose Sound-activated Speaker, and then press 
.
4. Press or to choose On or Off(always broadcast), and then press 
to confirm your selection.