LG DOUBLEPLAY MFL67441301 - Manual (Page 193)

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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 is considered for best use.
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 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.