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Safety
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.
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
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