15
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.
According to the ANSI C63.19 standard (ANSI
C63.19-2011 American National Standard
Methods of Measurement of Compatibility
Between Wireless Communications 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
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 these hearing aids is at least
M4. The equipment performance measurements,
categories and system classifications are based
upon the best information available but cannot
guarantee that all users will be satisfied.
Your hearing aids use the most modern
components to provide the best possible
sound quality in every listening situation.
However, communication devices such
as digital mobile phones can create
interference (a buzzing sound) in hearing
aids. If you experience interference from a
mobile phone being used close by, you can
minimize this interference in a number of
ways. Switch your hearing aids to another
program, turn your head in a different
direction or locate the mobile phone and
move away from it.
Labeling
The serial number and year of manufacture are
located under the colored hearing aid marking.
