Operation Manual

17
Operation
Some hearing aid users have reported a buzzing sound
in their hearing aids when they are using cell phones,
indicating that the cell phone and hearing aid may not
be compatible. According to the ANSI C63.19 standard
(ANSI C63.19-2006 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 aid is at least M2/T2. The
equipment performance measurements, categories
and system classifications are based upon the best
information available but cannot guarantee that all users
will be satisfied.
NOTE: The performance of individual hearing aids may
vary with individual cell phones. Therefore, please try this
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
cell phone provider for the booklet entitled “Hearing Aid
Compatibility with Digital Wireless Cell Phones.”