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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