Blackberry Curve 8320 Safety And Product Information page 24

hearing devices are more immune than others to this interference, and wireless
devices also vary in the amount of interference they generate.
The wireless telephone industry has developed ratings to assist hearing device users
in finding wireless devices that may be compatible with their hearing devices. Not
all wireless devices have been rated. Wireless devices that are rated will have the
rating displayed on their box together with other relevant approval markings.
The ratings are not guarantees. Results will vary depending on the user's hearing
device and hearing loss. If your hearing device is vulnerable to interference, you may
not be able to use a rated wireless device successfully.
Consulting with your hearing health professional and testing the wireless device with
your hearing device is the best way to evaluate it for your personal needs.
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/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/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
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