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12. Where can I find additional information?
For additional information, please refer to the following resources:
  FDA web page on wireless phones
(
http://www.fda.gov/Radiation-EmittingProducts/
RadiationEmittingProductsandProcedures/
HomeBusinessandEntertainment/CellPhones/default.htm
)
  Federal Communications Commission (FCC) RF Safety Program
(
http://www.fcc.gov/oet/rfsafety
)
  International Commission on Non-Ionizing Radiation Protection
(
http://www.icnirp.de
)
  World Health Organization (WHO) International EMF Project
(
http://www.who.int/peh-emf/en/
)
  National Radiological Protection Board (UK)
(
http://www.hpa.org.uk/radiation/
)
AVOID POTENTIAL HEARING LOSS
Prolonged exposure to loud sounds is the most common cause of preventable 
hearing loss. Some scientific research suggests that using portable audio devices, 
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 commonsense 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  
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.