LG MS500 Quick Reference Manual page 92

Safety
90
labeled. T4 is the better/ higher of the
two ratings.
Hearing devices may also be rated. Your
hearing device manufacturer or hearing
health professional may help you find
this rating. Higher ratings mean that
the hearing device is relatively immune
to interference noise. The hearing aid
and wireless phone rating values are
then added together. A sum of 5 is
considered acceptable for normal use.
A sum of 6 is considered for best use.
In the example to the left,
if a hearing aid meets the
M2 level rating and the
wireless phone meets the
M3 level rating, the sum of the two
values equal M5. This should provide the
hearing aid user with "normal usage"
while using their hearing aid with the
particular wireless phone. "Normal
usage" in this context is defined as a
signal quality that's acceptable for
normal operation.
The M mark is intended to be
synonymous with the U mark. The T