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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 be more usable with
a hearing device's telecoil ("T Switch" or
"Telephone Switch") than unrated phones. T4 is the
better/higher of the two ratings. (Note that not all
hearing devices have telecoils in them.)
Hearing devices may also be measured for
immunity to this type of interference. Your hearing
device manufacturer or hearing health professional
may help you choose the proper rating for your
mobile phone. The more immune your hearing aid
is, the less likely you are to experience interference
noise from mobile phones.
For more information about hearing aid
compatibility, visit the FCC's Consumer &
Governmental Affairs Bureau Web site at
www.fcc.gov/cgb/dro .
Kyocera Wireless Corp.
www.kyocera-wireless.com
To purchase accessories, visit
www.kyocera-wireless.com/store
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