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About Start-up Handling Options Tinnitus Warnings
More info
Mobile phone
Some hearing aid users have reported a
buzzing sound in their hearing aid when
they are using cell phones, indicating
that the cell phone and hearing aid may
not be compatible.
The ANSI C63.19 standard determines
the prediction of compatibility between
a specific hearing aid and a mobile
phone by: adding the numerical value of
the rating for the hearing aid immunity
to the numerical value of the rating for
the cell phone emissions. A sum of 4
would indicate that the combination
of wireless device and hearing aid is
usable; a combined rating that equals
at least 5 would provide normal use;
a combined rating of 6 or greater
would indicate excellent performance.
Whereas all hearing aids have acoustic
coupling, only the larger hearing aids
have the physical space for telecoil
(inductive) coupling. These two types
of coupling have different rating scales
(M1-M4 for acoustic coupling and T1-T4
for telecoil coupling, respectively) and
both ratings are therefore relevant
when predicting the compatibility of a
particular hearing aid.
For a hearing aid with both acoustic
coupling and telecoil coupling with a
rating of M4/T2 and with a telephone
rating of M3/T3), the combined rating
is 7 (M4 + M3) for the acoustic coupling
and 5 (T2 + T3} for the telecoil coupling.
According to the guideline given above,
both types of coupling will thereby be
acceptable, with the acoustic coupling
indicating excellent performance and
the telecoil coupling indicating normal
use.
The above equipment performance
measurements, categories and system
classifications are based upon the best
information available, but it cannot
be guaranteed that all users will be
satisfied.
The immunity of this hearing aid
is at least M2/T2. The equipment
performance measurements, categories
and system classifications are based
upon the best information available but
cannot guarantee that all users will be
satisfied.
IMPORTANT NOTICE
The performance of individual hearing aids may vary with individual
cell phones. Therefore, please try this hearing aid with your mobile
phone or, if you are purchasing a new phone, be sure to try it with your
hearing aid prior to purchase. For additional guidance, please ask your
cell phone provider for the booklet entitled “Hearing Aid Compatibility
with Digital Wireless Cell Phones“.
