TRENDnet TV-IP312 User Manual page 49

Video & Audio >> Audio
Camera Microphone In

Select the Enable option to enable the camera's audio function,
so that you can receive the on-site sound and voice from the
camera.
Camera Speaker Out

Select the Enable option to enable the camera's external speaker
function, so that the connected speaker can play the sound and
voice through the camera.
- Volume: Set the speaker's volume.
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