User's Manual

37
The ratings for compatibility of digital wireless devices with hearing aids are described in the
American National Standards Institute (ANSI) C63.19 standard:
M-Rating: Phones rated M3 or M4 meet FCC requirements and are likely to generate less
interference with hearing devices than phone that are not labeled. M4 is the better/higher of the two
ratings. (ATRIUM II F55L2) is rated M3.
T-Rating: Phones rated T3 or T4 meet FCC requirements and are likely be more usable with hearing
devices’ telecoil than unrated phones. T4 is the better/higher of the two ratings.
(ATRIUM II F55L2) is rated T3.
The more immune the hearing aid device is, the less likely one is to experience interference noise
from the wireless phone. Hearing aid devices may also be rated. Adding the rating of the hearing aid
and the phone would determine probable usability:
1. Any combined rating equal to or greater than six offers the best use.
2. Any combined rating equal to five is considered normal use.
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 this
device successfully. Trying out this device with your hearing device is the best way to evaluate it for
your personal needs. This device has been tested and rated for use with hearing aids for some of the
wireless technologies that it utilizes. However, there may be some newer wireless technologies used
in this phone that have not been tested yet for use with hearing aids. It is important to try the