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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
referencedinSection20.19oftheFCCRules.
The HAC rating and measurement procedure are
described in the American National Standards
Institute(ANSI)C63.19standard.
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.
For information about hearing aids and digital
wireless phones:
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