Samsung Galaxy Note 3 Important Information Manual page 39

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.
Important Health and Safety Information
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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