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For your safety
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
better/ higher of the two ratings.
Hearing devices may also be rated. Your hearing device manufacturer or hearing
health professional may help you find this rating.
Higher ratings mean that the hearing device is relatively immune to interference
noise.
The hearing aid and wireless phone rating values are then added together. A sum of
5 is considered acceptable for normal use. A sum of 6 is considered for best use.
In the example to the left, if a hearing aid meets the M2 level
rating and the wireless phone meets the M3 level rating, the sum
of the two values equal M5. This should provide the hearing aid
user with “normal usage” while using their hearing aid with the
particular wireless phone. “Normal usage” in this context is defined as a signal quality
that’s acceptable for normal operation.
The M mark is intended to be synonymous with the U mark. The T mark is intended
to be synonymous with the UT mark. The M and T marks are recommended by the
Alliance for Telecommunications Industries Solutions (ATIS).
The U and UT marks are referenced in Section 20.19 of the FCC Rules. The HAC
rating and measurement procedure are described in the American National Standards
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