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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
for your hearing device. The more immune your hearing aid is, the less likely you are
to experience interference noise from wireless devices.
For additional information about the FCC's actions with regard to hearing aid
compatible wireless devices and other steps the FCC has taken to ensure that
individuals with disabilities have access to telecommunications services, please go
to www.fcc.gov/cgb/dro.
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