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 above example, 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 is synonymous
for T ratings. 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 is
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
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