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For Your Safety 137
Some hearing devices are more immune than others to this interference noise, and
devices also vary in the amount of interference they generate.
The wireless telephone industry has developed a rating system for wireless devices,
to assist hearing device users to find devices that may be compatible with their
hearing devices. Not all devices have been rated. Devices that are rated have the
rating on their box or a label located on the box.
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.
The M mark is intended to be synonymous with the U mark. The T mark is intended
to be synonymous with the UT mark. The M and T marks are recommended by
the Alliance for Telecommunications Industries Solutions (ATIS). The U and UT
marks are referenced in Section 20.19 of the FCC Rules. The HAC rating and
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