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User's Manual

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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.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to generate less
interference to hearing devices than phones that are not labeled. T4 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 Standards
Institute (ANSI) C63.19 standard.
To enter that the Hearing Aid Compatibility rating for your phone is maintained, secondary
transmitters such as Bluetooth components must be disabled during a call.