ZTE D930 - Manual (Page 32)

Additional safety information 30
While some wireless phones are
used near some hearing devices
(hearing aids and cochlear implants),
users may detect a buzzing,
humming, or whining noise.
Some hearing devices are more
immune than others to this
interference noise, and phones also
vary in the amount of interference
they generate.
The wireless telephone industry
has developed a rating system for
wireless phones, to assist hearing
device users find phones that may
be compatible with their hearing
devices. Not all phones have been
rated. Phones that are rated have
the rating on their box or a label
located on the box.
The ratings are not guarantees.
Results will vary depending on the
user's hearing device and 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
to 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