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devices. Not all phones have been rated. Phones that have
been rated have a label on the box.
Your Z750C has been tested for hearing aid device
compatibility and has an M4 /T4.
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
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