User's Manual

158
SAFETY
Not all phones have been rated. Phones that are rated have the
rating on their box or a label located on the box. The ratings are
not guarantees. 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
phone successfully. Trying out the phone with your hearing device
is the best way to evaluate it for your personal needs.
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.
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