74 75
23. Important information:
Cell phones
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)
is5, 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 classications are
based upon the best information available but cannot
guarantee that all users will be satised. The immunity
ofthis hearing aid is at least M2/T2.
Note: 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 for the booklet entitled “hearing
aid compatibility with digital wireless cell phones.”