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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
mobile phones, indicating that the mobile phone
and hearing aids may not be compatible. Accord-
ing to the ANSI C63.19 standard (ANSI C63.19-2011
American National Standard Methods of Measure-
ment of Compatibility Between Wireless Communi-
cations Devices and Hearing Aids), the compatibility
of particular hearing aids and a mobile phone can
be predicted by adding the rating for the hearing aid
immunity to the rating for the mobile phone emis-
sions. For example, the sum of the hearing aid rating
of 4 (M4) and a telephone rating of 3 (M3) would re-
sult 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 these hearing aids is at least
M4. The equipment performance measurements,
categories and system classications are based
upon the best information available but cannot
guarantee that all users will be satised.
The performance of the individual hearing
aids may vary with individual mobile phones.
Therefore, please try these hearing aids with
your mobile phone or, if you are purchasing a
new phone, please be sure to try it with your
hearing aids prior to purchase.
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