Verykool RS90 User Manual
Page 16
generate less interference to hearing devices than phones that are not rated.
M4 is the better/higher of the two ratings.
RS90 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.
RS90 is rated T3.
Please power off the Bluetooth function while using hearing aid devices with
your RS90.
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:
Gallaudet University, RERC: