Samsung SCH-S380C User Manual page 112

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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