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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.
When you’re talking over the cell phone, it’s recommended
you’d turn the BT (Bluetooth
®
) mode off for HAC.
According to HAC policy (KDB 285076), we state this handset
has not been rated for hearing aid compatibility with respect to
the Wi-Fi capability.