LG UN272 - Manual (Page 159)

Safety 159
In the above example, 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 is synonymous for T ratings.
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 is
acceptable for normal operation.
The M mark is intended to be
synonymous with the U mark. The T
mark is intended to be synonymous
with the UT mark. The M and T marks
are recommended by the Alliance
for Telecommunications Industries