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Important Health, Safety, and Warranty Information 19
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 ind
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.
However, these are not guarantees
that all users will be satisied. T ratings
work similarly.
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