32
hearing device is the best way to evaluate it for your
personal needs.
M-Ratings:PhonesratedM3orM4meetFCC
requirements and are likely to generate less
interference to hearing devices than phones that
arenotlabeled.M4isthebetter/higherofthetwo
ratings.
T-Ratings:PhonesratedT3orT4meetFCC
requirements and are likely to generate less
interference to hearing devices than phones that
arenotlabeled.T4isthebetter/higherofthetwo
ratings.
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. The hearing aid and wireless
phone rating values are then added together. A sum
of5isconsideredacceptablefornormaluse.Asum
of6isconsideredforbestuse.
In the above example, if a hearing aid meets the
M2levelratingandthewirelessphonemeetsthe
M3levelrating,thesumofthetwovaluesequal
M5.Thisshouldprovidethehearingaiduserwith
“normal usage”while using their hearing aid with
the particular wireless phone. “Normal usage”in
this context is defined as a signal quality that’s
acceptable for normal operation. The M mark is
intended to be synonymous with the U mark. The