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182
*In the United States and Canada,
the SAR limit for mobile phones
used by the public is 1.6 watts/kg
(W/kg) averaged over one gram of
tissue. The standard incorporates a
substantial margin of safety to give
additional protection for the public
and to account for any variations in
measurements.
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On July 10, 2003, the U.S. Federal
Communications Commission (FCC)
Report and Order in WT Docket 01-
309 modified the exception of
wireless phones under the Hearing
Aid Compatibility Act of 1988 (HAC
Act) to require digital wireless
phones be compatible with hearing-
aids. The intent of the HAC Act is to
ensure reasonable access to
telecommunications services for
persons with hearing disabilities.
While some wireless phones are
used near some hearing devices
(hearing aids and cochlear
implants), users may detect a
buzzing, humming, or whining noise.
Some hearing devices are more
immune than others to this
interference noise, and phones also
vary in the amount of interference
they generate.
The wireless telephone industry
has developed a rating system for
wireless phones, to assist hearing
device users to find phones that
may be compatible with their
hearing devices. Not all phones
have been rated. Phones that are
rated have the rating on their box or
a label located on the box.
The ratings are not guarantees.
Results will vary depending on the
user's hearing device and hearing
loss. If your hearing device
happens to be vulnerable to
interference, you may not be able to
use a rated phone successfully.
Trying out the phone with your
hearing device is the best way to
evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4
meet FCC requirements and are
likely to generate less interference
to hearing devices than phones that
are not labeled. M4 is the
better/higher of the two ratings.
T-Ratings: Phones rated T3 or T4
meet FCC requirements and are
likely to generate less interference
to hearing devices than phones that
are not labeled. T4 is the