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Mobile phone compatibility rating
Some hearing aid users have reported a buzzing
sound in their hearing aids when they are using
cell phones, indicating that the cell phone and
hearing aid may not be compatible. According
to the ANSI C63.19 standard (ANSI C63.19-
2006 American National Standard Methods of
Measurement of Compatibility Between Wireless
Communications Devices and Hearing Aids), the
compatibility of a particular hearing aid and cell
phone can be predicted by adding the rating for
the hearing aid immunity to the rating for the cell
phone emissions. For example, the sum of the
hearing aid rating of 4 (M4) and a telephone rating
of 3 (M3) would result in a combined rating of 7.
Any combined rating that equals at least 5 would
provide "normal use"; a combined rating of 6 or
greater would indicate "excellent performance. "
The immunity of this hearing aid is at least
M4/T4*. The equipment performance
measurements, categories and system
classifications are based upon the best
information available but cannot guarantee that
all users will be satisfied.
* For models featuring a telecoil input option
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The performance of the individual hearing aids
may vary with individual cell phones. Therefore,
please try this hearing aid with your cell phone
or, if you are purchasing a new phone, please
be sure to try it with your hearing aid prior to
purchase.
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