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Safety
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The ratings are not guaranteed. Results will vary depending on the user’s
hearing device and hearing loss. If your hearing device happens to be
vulnerable to interference, you may not be able to use a rated device
successfully. Trying out the device with your hearing device is the best way
to evaluate it for your personal needs.
M-Ratings: Devices rated M3 or M4 meet FCC requirements and are likely
to generate less interference to hearing devices than devices that are not
labeled. M4 is the better/higher of the two ratings.
T-Ratings: Devices rated T3 or T4 meet FCC requirements and are likely to
generate less interference to hearing devices than devices that are not
labeled. T4 is the better/ higher of the two ratings.
Hearing devices may also be rated. Your hearing device manufacturer or
hearing health professional may help you find this rating. Higher ratings
mean that the hearing device is relatively immune to interference noise. The
hearing aid and wireless device rating values are then added together.
A sum of 5 is considered acceptable for normal use. A sum of 6 is
considered for best use.
In the above example, if a hearing aid meets the M2 level rating and the
wireless device meets the M3 level rating, the sum of the two values equal
M5. This should provide the hearing aid user with “normal usage” while
using their hearing aid with the particular wireless device. “Normal usage”
in this context is defined as a signal quality that’s acceptable for normal
operation.
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