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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 Solutions (ATIS).
The U and UT marks are
referenced in Section 20.19 of
the FCC Rules. The HAC