Nikon D720 User Manual page 217

Option
Choose whether the
brightest areas of the frame
(highlights) are shown by
slanting lines in the live
Highlight display
view display. To access this
option, select mode P, S, A,
or M.
Press 1 or 3 to adjust
headphone volume.
Headphone
volume
A
Using an External Microphone
The optional stereo microphone can be used to record sound in stereo
or to avoid recording focus noise and other sounds made by the lens
(0 319).
A
Headphones
Third-party headphones can be used. Note that high sound levels may
result in high volume; particular care should be taken when
headphones are used.
Description
Highlights
193