User's Manual

20 / 20
wireless phones, to assist hearing device users find phones that may be compatible with their
hearing 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
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 rated. M4 is the better/higher of the two
ratings.
L500U is rated M3.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to be more usable with a
hearing aid’s telecoil than phones that are not rated. T4 is the better/higher of the two ratings.
L500U is rated T3.
Please power off the Bluetooth and Wi-Fi function while using hearing aid devices with your
L500U.
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.
Safety and regulatory guide
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 better use. A sum of 8 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. This
methodology applies equally for T ratings. 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
marks are referenced in Section 20.19 of the FCC Rules. The HAC rating and measurement
procedure are described in the American National Standards Institute (ANSI) C63.19 standard.
For information about hearing aids and digital wireless phones
FCC Hearing Aid Compatibility and Volume Control:
http://www.fcc.gov/cgb/dro/hearing.html
Gallaudet University, RERC:
https://fjallfoss.fcc.gov/oetcf/eas/reports/GenericSearch.cfm