added together. A sum of 5 is considered acceptable for
normal use. A sum of 6 is considered for better use. A sum
of 8 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 is acceptable for normal
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