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SAFETY
vulnerable to interference, you may not be able to use a rated
phone successfully. Trying out the phone with your hearing
device is the best way to evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and
are likely to generate less interference to
hearing devices than phones that are not
labeled. M4 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 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.
Summary of Contents for impulse CDM7075
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