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Health and Safety Information       151
• 
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:
American Academy of Audiology
11730 Plaza American Drive, Suite 300
Reston, VA 20190
Voice: (800) 222-2336
Email: info@audiology.org
National Institute on Deafness and Other 
Communication Disorders
National Institutes of Health
31 Center Drive, MSC 2320
Bethesda, MD 20892-2320
Email: nidcdinfo@nih.gov
National Institute for Occupational Safety 
and Health (NIOSH)
395 E Street, S.W., Suite 9200
Patriots Plaza Building
Washington, DC 20201
Voice: 1-800-35-NIOSH 
(1-800-356-4674)
1-800-CDC-INFO (1-800-232-4636)
Outside the U.S. 513-533-8328