User Guide

Important Safety Information 45
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.
However, these are not guarantees that all users
will be satisfied. T ratings work similarly.
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