Unitron InseraMD B1-312 Guide D'utilisation page 39

Mobile phone compatibility rating
Some hearing aid users have reported a
buzzing sound in their 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".
The equipment performance measurements,
categories and system classifications are based
upon the best information available but cannot
guarantee that all users will be satisfied. The
immunity of this hearing aid is at least M2/T2.
68
The performance of individual hearing aids
may vary with individual cell phones. Therefore,
please try the hearing aid with your cell phone
or, if you are purchasing a new phone, be sure
to try it with your hearing aid prior to purchase.
For additional guidance, please ask your
hearing care professional.
69