User Manual

29
Higher ratings mean that the hearing device is
relatively immune to interference noise. Under
the current industry standard, American National
Standards Institute (ANSI) C63.19, the hearing
aid and wireless mobile device rating values are
added together to indicate how usable they are
together. For example, if a hearing aid meets the
M2 level rating and the wireless mobile device
meets the M3 level rating, the sum of the two
values equals M5.
Under the standard, this should provide the
hearing aid user with normal use while using the
hearing aid with the particular wireless mobile
device. A sum of M6 or more would indicate
excellent performance.
However, these are not guarantees that all users
will be satised. T-ratings work similarly.
M3 + M2 = 5
T3 + T2 = 5
The HAC rating and measurement procedure are
described in the American National Standards
Institute (ANSI) C63.19 standard.
HAC for Newer Technologies
This device has been tested and rated for use with
hearing aids for some of the wireless technologies
that it uses. However, there may be some newer
wireless technologies used in this device that
have not been tested yet for use with hearing aids.