Nikon S6400 - Manual (Page 225)

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Sound Settings
Adjust the following sound settings.
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Notes About Sound Settings
Button sounds and the shutter sound are disabled when using the Pet portrait scene mode.
Tap F M z (setup menu) M Sound settings
Option Description
Button sound
Select On (default setting) or Off. When On is selected, a beep will
sound once when operations are completed successfully, twice
when the camera acquires focus on the subject, and three times
when an error is detected. Start-up sound will also play when the
camera is turned on.
Shutter sound
Select On (default setting) or Off.
The shutter sound is disabled even if On is selected, when using any
continuous shooting settings other than Single (
E59) or when
recording movies.