User Manual

Health and Safety Information 47
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