User Guide

44 Important Safety Information
hearing aids and other assistive hearing
devices.
When individuals employing some assistive
hearing devices (hearing aids and cochlear
implants) use wireless mobile devices, they
may detect a buzzing, humming, or whining
noise. Some hearing devices are more immune
than others to this interference noise, and
mobile devices also vary in the amount of
interference they generate.
The wireless telephone industry has developed
a rating system for wireless mobile devices to
assist hearing device users find mobile devices
that may be compatible with their hearing
devices. Not all mobile devices have been
rated. Mobile devices 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 mobile device successfully.
Trying out the mobile device with your hearing
device is the best way to evaluate it for your
personal needs.
M-Ratings: Wireless mobile devices rated M3
or M4 meet FCC requirements and are likely to
generate less interference to hearing devices
than mobile devices that are not labeled. M4 is
the better/higher of the two ratings. M-ratings
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