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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.
Wireless Phones and Hearing Aid
Accessibility
http://www.accesswireless.org/
Gallaudet University, RERC
http://tap.gallaudet.edu/Voice/
FCC Hearing Aid Compatibility
and Volume Control
http://www.fcc.gov/cgb/dro/
hearing.html
The Hearing Aid Compatibility
FCC Order
http://hraunfoss.fcc.gov/
edocs_public/attachmatch/FCC-
03-168A1.pdf
Hearing Loss Association of
America [HLAA]
http://hearingloss.org/content/
telephones-and-mobile-devices
Caution:
Avoid potential hearing
loss.
Prolonged exposure to loud
sounds (including music) is
the most common cause of
preventable hearing loss. Some
scientific research suggests that
using portable audio devices, such
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