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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 that the FCC has taken to ensure that individuals with

disabilities have access to telecommunications services, please go to www.fcc.gov/cgb/dro.