Table of Contents
Advertisement
interference they generate. The wireless telephone industry has developed ratings for some of
their mobile phones to assist hearing device users in finding phones that may be compatible with
their hearing devices. Not all phones have been rated. Phones that have been rated have a label
on the box. Your F450 has been tested for hearing aid device compatibility and has an M4 and/or
T4 rating.
These ratings are not guaranteed. Results will vary, depending on the level of immunity of your
hearing device and the degree of your hearing loss. If your hearing device happens to be
vulnerable to interference, you may not be able to use a rated phone successfully. Trying out the
phone with your hearing device is the best way to evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate less
interference with hearing devices than phones that are not labeled. M4 is the better/higher of
the two ratings.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to be more usable with
a hearing device's telecoil ("T Switch" or "Telephone Switch") than unrated phones. T4 is the
better/higher of the two ratings. (Note that not all hearing devices contain telecoils.) The more
immune your hearing aid device is, the less likely you are to experience interference noise
from your wireless phone.
Hearing devices may also be measured for immunity to this type of interference. Your hearing
device manufacturer or hearing health professional may help you find results for your hearing
device.
For additional information about the FCC's actions with regard to hearing aid compatible wireless
devices and other steps the FCC has taken to ensure that individuals with disabilities have
access to telecommunications services, please go to www.fcc.gov/cgb/dro.
Turning on the HAC Setting
When the HAC setting is on, your F450 sends the audio from your phone calls to the telecoil rather
than to the microphone of your hearing aid. You are likely to hear calls much better because volume
is increased and background noise and feedback are diminished. The HAC setting improves only the
calls you listen to through the earpiece. It does not affect calls heard on the speakerphone or with a
headset. It's better to turn off the Bluetooth function when the HAC setting is on. HAC requires extra
battery power, so watch your battery consumption when it's turned on.
CAUTION: Do not turn on the HAC setting unless you use a hearing aid with a telecoil. Using this
setting without a hearing aid or with a hearing aid without a telecoil may be harmful to your hearing.
Copyright Notice
The video/audio recordings you download are protected by copyright laws. They are for your
personal use only and must not be otherwise used without the permission of the copyright owner.
42
Advertisement
Table of Contents
