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Never wash the microphone inputs. Doing
so could cause it to lose its special acoustic
features.
Do not use your hearing aid in areas where
electronic equipment is prohibited.
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.”
