Samsung SGH-I527ZKBATT - Manual (Page 34)

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more immune than others to this interference noise, and
mobile devices also vary in the amount of interference
they generate.
The wireless telephone industry has developed a rating
system for wireless mobile devices to assist hearing
device users find mobile devices that may be compatible
with their hearing devices. Not all mobile devices have
been rated. Mobile devices that are rated have the rating
on their box or a label located on the box.
The ratings are not guarantees. Results will vary
depending on the user's hearing device and hearing
loss. If your hearing device happens to be vulnerable to
interference, you may not be able to use a rated mobile
device successfully. Trying out the mobile device with
your hearing device is the best way to evaluate it for
your personal needs.
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 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.