Filter
Top Products
62
Safety
the box.
The ratings are not guarantees. Results will vary depending on the user’s
hearing device and hearing loss. If your hearing device happens to be
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’s
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
US740GSG(eng).indd 62 2010.10.12 10:39:43 AM