Blackberry Bold 9900 Safety And Product Information page 38

the different features of your BlackBerry device thoroughly and in different
locations to determine if you hear any interfering noise when using this
BlackBerry device with your hearing aid or cochlear implant. Consult your
wireless service provider about its return and exchange policies and for
information about hearing aid compatibility.
How the ratings work
M-Ratings: Wireless devices rated M3 or M4 meet FCC requirements and
are likely to generate less interference to hearing devices than wireless
devices that are not labeled. M4 is the better or higher of the two ratings.
T-Ratings: Wireless devices 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 wireless devices. T4 is the better or
higher of the two ratings. (Note that not all hearing devices have telecoils in
them.)
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. The more
immune your hearing aid is, the less likely you are to experience
interference noise from wireless devices.
For more information about the actions that the FCC has taken with regard
to hearing aid compatibility with wireless devices and other steps that the
FCC has taken to ensure that individuals with disabilities have access to
telecommunications services, visit www.fcc.gov/cgb/dro.
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