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SAFETY INFORMATION
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate less interference to hearing devices
than phones that are not labeled. M4 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
phone 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 phone 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 phone. “Normal usage” in this context is defined as a signal quality that is 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