C78 User Manual
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M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate
less interference with 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 contain telecoils.) The more immune your hearing
aid device is, the less likely you are to experience interference noise from your
wireless phone. Hearing aid devices should have ratings similar to those of phones.
Ask your hearing health-care professional for the rating of your hearing aid.
Hearing devices may also be measured for immunity to this type of interference. Your
hearing device manufacturer or hearing health professional may help you find results
for your hearing device. The more immune your hearing aid is, the less likely you are
to experience interference noise from wireless devices.
For additional information about the FCC's actions with regard to hearing aid compatible
wireless devices and other steps the FCC has taken to ensure that individuals with
disabilities have access to telecommunications services, please go to www.fcc.gov/cgb/dro.
