Verykool R80 - Manual (Page 40)

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.
R80 is rated T3.
Please power off the Bluetooth function while using
hearing aid devices with your R80.
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