Samsung Galaxy J7 User Manual page 184

M-Ratings: Wireless mobile devices rated M3
or M4 meet FCC requirements and are likely to
generate less interference to hearing devices
than mobile devices that are not labeled. M4 is
the better/higher of the two ratings. M-ratings
refer to enabling acoustic coupling with
hearing aids that do not operate in telecoil
mode.
T-Ratings: Mobile devices rated T3 or T4 meet
FCC requirements and are likely to generate
less interference to hearing devices than
mobile devices that are not labeled. T4 is the
better/higher of the two ratings. T-ratings refer
to enabling inductive coupling with hearing
aids operating in telecoil mode.
Hearing devices may also be rated. Your
hearing aid manufacturer or hearing health
professional may help you find this rating.
Higher ratings mean that the hearing device is
relatively immune to interference noise.
Under the current industry standard, American
National Standards Institute (ANSI) C63.19, the
hearing aid and wireless mobile device rating
values are added together to indicate how
usable they are together. For example, if a
hearing aid meets the M2 level rating and the
wireless mobile device meets the M3 level
rating, the sum of the two values equals M5.
Under the standard, this should provide the
hearing aid user with normal use while using
the hearing aid with the particular wireless
mobile device. A sum of 6 or more would
indicate excellent performance.
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