Samsung SM-R3820WRAXAR - Manual (Page 34)

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• Avoid using headphones after exposure to
extremely loud noises, such as rock concerts,
that might cause temporary hearing loss.
Temporary hearing loss might cause unsafe
volumes to sound normal.
• Do not listen at any volume that causes you
discomfort. If you experience ringing in your
ears, hear muffled speech, or experience any
temporary hearing difficulty after listening to
your portable audio device, discontinue use and
consult your doctor.
You can obtain additional information on this
subject from the following sources: