User's Manual
Settings 47
M-Rating stands for Microphone rating and indicates the amount of reduction of RF interference
between the telephone and the hearing aid in acoustic coupling mode (also called microphone
mode).
Phones rated M3 or M4 meet FCC requirements and generate less interference to hearing
devices set in microphone mode. T-Rating stands for telecoil rating and represents inductive
coupling with hearing aids that are operating in telecoil mode. A telecoil is a small piece of
tightly wrapped wire built into some hearing aids. While the microphone of a hearing aid picks
up all sounds, the telecoil will only pick up an electromagnetic signal from the telephone. Thus,
users of telecoil-equipped hearing aids are able to communicate over the telephone without the
amplification of unwanted background noise.
Phones rated T3 or T4 meet FCC requirements and generate less interference to hearing
devices set in telecoil mode.
A combination of M-rating and T-rating defines the final HAC rating and is a deciding factor in
selecting cellular phones for people with hearing problems. A HAC compliant phone could be
rated:
M3/T3
M3/T4
M4/T3
M4/T4
These ratings assist hearing device users to find phones that are compatible with their hearing
characteristics of the used hearing device, i.e. its resistance to interference. The best way to
evaluate the suitability of the phone is to try it with the intended hearing aid device.
SONXP3410 (FCC model number: XP3410 IS) has been tested for hearing aid device
compatibility and complies with the Federal Communications Commission (FCC) requirements.
SONXP3410 (FCC model number: XP3410 IS) is rated M4/T4.
Hearing Aid Compatibility (HAC) Settings
Follow the instructions below to enable coupling with a hearing aid device operating in
telecoil/microphone mode.
Select Menu (left selection key) > Settings > Phone settings > Hearing aid > ON.
Once HAC is enabled, the HAC symbol is displayed in the indicator bar. Select OFF to disable
this feature.
Note: While using the mobile phone for voice calls with hearing aid, slightly adjust the position
of the phone against the ear to reduce the interference and to give better voice quality.