Filter
Top Products
123
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
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 Institute
(ANSI) C63.19 standard.
Other Medical Devices
If you use any other personal medical devices, consult
the manufacturer of your device to determine if it is
M3 + M2 = 5
T3 + T2 = 5