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TWOm User Guide - R1.0.2 - October 7, 2010 106
Caution: Avoid potential hearing loss
Prolonged exposure to loud sounds (including music) is the most common cause of preventable
hearing loss. Some scientific research suggests that using portable audio devices, such as portable
music players and cellular telephones, at high volume settings for long durations, may lead to
permanent noise-induced hearing loss. This includes the use of headphones (including headsets,
earbuds, and Bluetooth® or other wireless devices). Exposure to very loud sound has also been
associated in some studies with tinnitus (a ringing in the ear), hypersensitivity to sound, and
distorted hearing. Individual susceptibility to noise-induced hearing loss and other potential hearing
problems varies. The amount of sound produced by a portable audio device varies depending on the
nature of the sound, the device, the device settings, and the headphones. You should follow some
common sense recommendations when using any portable audio device:
• Set the volume in a quiet environment and select the lowest volume at which you can hear
adequately.
• When using headphones, turn the volume down if you cannot hear the people speaking near you or
if the person sitting next to you can hear what you are listening to.
• Do not turn the volume up to block out noisy surroundings. If you choose to listen to your portable
device in a noisy environment, use noise cancelling headphones to block out background
environmental noise.
• Limit the amount of time you listen. As the volume increases, less time is required before your
hearing could be affected.
• 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
Internet: www.audiology.org
National Institute on Deafness and Other Communication Disorders
National Institutes of Health
31 Center Drive, MSC 2320