C79 User Manual
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These ratings are not guarantees. Results will vary, depending on the level of immunity of
your hearing device and the degree of your 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 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.
Turn on the HAC Setting
When the HAC setting is on, your C79 sends the audio from your phone calls to the telecoil
rather than to the microphone of your hearing aid. You are likely to hear calls much better