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About Start up Handling Options Warnings
More info
Mobile phone
Some hearing instrument users have
reported a buzzing sound in their
hearing instrument when they are
using mobile phones, indicating that
the mobile phone and hearing
instrument may not be compatible.
The ANSI C63.19 standard deter-
mines the prediction of compatibility
between a specific hearing instrument
and a mobile phone by: adding the
numerical value of the rating for the
hearing instrument 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 instrument
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 instruments have
acoustic coupling, only the larger
instruments have the physical space
for telecoil (inductive) coupling. These
two types of coupling have different
rating scales (M1-M4 for acoustic cou-
pling and T1-T4 for telecoil coupling,
respectively) and both ratings are
therefore relevant when predicting the
compatibility of a particular hearing
instrument.
For a hearing instrument with both
acoustic coupling and telecoil coupling
with a rating of M4/T2 and with a tele-
phone 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 guidelines
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
instrument is M4/T4.
IMPORTANT NOTICE
The performance of individual hearing instruments may vary with
individual mobile phones. Therefore, please try this hearing instrument
with your mobile phone or, if you are purchasing a new phone, be sure to
try it with your hearing instrument prior to purchase.
For additional guidance, please ask your mobile phone provider for the
booklet entitled “Hearing Aid Compatibility with Digital Wireless Cell
Phones.”