LG AS855 - Manual (Page 123)

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hearing health professional may help
you find this rating. Higher ratings
mean that the hearing device is
relatively immune to interference
noise. The hearing aid and wireless
phone rating values are then added
together. A sum of 5 is considered
acceptable for normal use. A sum of
6 is considered for best use.
In the example
to the left, if a
hearing aid
meets the M2
level rating and
the wireless
phone meets the M3 level rating, the
sum of the two values equal M5.
This should provide the hearing aid
user with “normal usage” while
using their hearing aid with the
particular wireless phone. “Normal
usage” in this context is defined as a
signal quality that’s acceptable for
normal operation.
The M mark is intended to be
synonymous with the U mark. The T
mark is intended to be synonymous
with the UT mark. The M and T
marks are recommended by the
Alliance for Telecommunications
Industries Solutions (ATIS). The U
and UT marks are referenced in
Section 20.19 of the FCC Rules. The
HAC rating and measurement
procedure are described in the
American National Standards
Institute (ANSI) C63.19 standard.
When you're talking on a cell phone,
it's recommended that you turn the
BT (Bluetooth) mode off for HAC.
Safety
For information about hearing aids and digital wireless phones
Wireless Phones and Hearing Aid Accessibility
http://www.accesswireless.org/
FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/consumerfacts/hac_wireless.html