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Safety
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. When you're talking on a cell phone, it's
recommended that you turn the BT or WLAN mode off for HAC. 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 ensure that the Hearing Aid
Compatibility rating for your phone is maintained, secondary transmitters such as
Bluetooth and WLAN components must be disabled during a call. When you're talking
over the cell phone, it's recommended you'd turn the BT (Bluetooth) or WLAN mode
off for HAC. This phone has been tested and rated for use with hearing aids for some
of the wireless technologies that it uses. However, there may be some newer wireless
technologies used in this phone that have not been tested yet for use with hearing
aids. It is important to try the different features of this phone thoroughly and in different
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