LifeWatch ECG Mini, User Manual, Page: 53 / 59

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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 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 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 Solutions (ATIS). The U and UT marks are referenced in
Section 20.19 of the FCC Rules. The HAC rating and measurement
procedure are described in the American National Standards
Institute (ANSI) C63.19 standard.
Some digital wireless phones may interfere with some hearing aids.
In the event of such interference, you may wish to consult your
hearing aid manufacturer to discuss alternatives.