Zte Z992 User Manual page 29

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 have telecoils in them.)
Your phone meets the M3/ T4 level rating.
Hearing devices may also be rated. Your hearing
device manufacturer or hearing health
professional may help you find this rating. For
more information about FCC Hearing Aid
Compatibility,
please go to http://www.fcc.gov/cgb/dro.
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