Filter
Top Products
121
successfully. Trying out the phone
with your hearing device is the best
way to evaluate it for your personal
needs.
M-Ratings: Phones rated M3 or M4
meet FCC requirements and are likely
to generate less interference to
hearing devices than phones that are
not labeled. M4 is the better/higher of
the two ratings.
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 example to
the left, 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.
When you're talking on a cell phone,
it's recommended that you turn the
BT (Bluetooth) mode off for HAC.
Safety
For information about hearing aids and digital wireless phones
Wireless Phones and Hearing Aid Accessibility
http://www.accesswirele ss.org/hearingaid/
FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/consumerfacts/hac_wir ele ss.html