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For Your Safety
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 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
the FCC and can be found under the Display Grant section of http://www.
procedure are described in the American National Standards Institute (ANSI) C63.19
standard. When you're talking on a cell phone, it's recommended that you turn the BT
(Bluetooth) or WLAN mode off for HAC.
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.
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For information about hearing aids
and digital wireless phones Wireless
Phones and Hearing Aid Accessibility
http://www.accesswireless.org/Home.aspx
.
FCC Hearing Aid Compatibility and
Volume Control
http://www.fcc.gov/cgb/consumerfacts
/hac_wireless.htm
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