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About Start up Handling Options Warnings
More info
Mobile phone
Some hearing aid users have reported
a buzzing sound in their hearing aid
when they are using mobile phones,
indicating that the mobile phone and
hearing aid may not be compatible.
The ANSI C63.19 standard deter-
mines the prediction of compatibility
between a specific hearing aid and a
mobile phone by: adding the numeri-
cal value of the rating for the hearing
aid immunity to the numerical value
of the rating for the mobile 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 com-
bined rating of 6 or greater would
indicate excellent performance.
Whereas all hearing aids have acous-
tic 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 cou-
pling, respectively) and both ratings
are therefore relevant when predict-
ing 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 cou-
pling and 5 (T2 + T3) for the telecoil
coupling. According to the guidelines
given above, both types of coupling
will thereby be acceptable, with the
acoustic coupling indicating excellent
performance and the telecoil cou-
pling 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 perfor-
mance 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
mobile 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 mobile phone provider for the
booklet entitled “Hearing Aid Compatibility with Digital Wireless Cell
Phones.”
