68 69
Labeling
The serial number and year of manufacture are
located on the outside of the hearing aid.
Mobile phone compatibility rating
Some hearing aid users have reported a
buzzing sound intheir hearing aids when they
are using cell phones. According to the ANSI
63.19 (American National Standard Methods
of Measurement of Compatibility between
Wireless Communications Devices and Hearing
Instruments) standard, 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. The sum of the hearing aid rating
(e.g. M2/T2=2) and the telephone rating
(e.g. M3/T3=3) is 5, and any combination
that equals 5 will provide “normal use”; a
sum of 6 or greater would indicate “excellent
performance”.
Theequipment performance measurements,
categories and system classications are
based upon the best information available but
cannot guarantee that all users will be satised.
The immunity of this hearing aid is at least
M2/T2.
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