User manual

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devices. 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 this.
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.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to generate
less interference to hearing devices than phones 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 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 example illustrated above, 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