User's Manual

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.

To ensure that the Hearing Aid Compatibility rating for

your phone is maintained, secondary transmitters such

as Bluetooth 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