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cell phone
Some hearing instrument users have reported a buzzing sound in their hearing
instrument when they are using cell phones, indicating that the cell phone
and hearing instrument may not be compatible.
According to the ANSI C63.19 standard (ANSI C63.19–2007 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 a hearing aid rating of 2 (M2/T2) and a
telephone rating of 3 (M3/T3) would result in a combined rating of 5. 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 instrument is M2. The equipment performance
measurements, categories and system classifications are based upon the best
information available but cannot guarantee that all users will be satisfied.
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