Safe
ty
116
Sa
fe
ty
able t
o use a r
ated phone
succe
ssfull
y. T
rying out the
phone with y
our hearing de
vice
is the be
st w
ay t
o e
valua
te
it for
your per
sonal needs.
M-R
atings: Phone
s r
ated M3 or
M4 mee
t FCC r
equir
ement
s and
ar
e lik
el
y t
o gener
ate le
ss
int
er
fer
ence t
o hearing de
vice
s
than phone
s tha
t ar
e no
t
labeled. M4 is the be
tter/higher
of the t
w
o r
atings.
Hearing de
vice
s ma
y also be
ra
ted. Y
our hearing de
vice
man
ufactur
er or hearing health
pr
ofe
ssional ma
y help y
ou find
this r
ating. Higher r
atings mean
tha
t the hearing de
vice is
rela
tiv
el
y imm
une t
o int
er
fer
ence
noise. The hearing aid and
wir
ele
ss phone r
ating v
alue
s ar
e
then added t
oge
ther
. A sum of 5
is consider
ed accep
table for
normal use. A sum of 6 is
consider
ed for be
st use.
In the abo
ve
e
xample, if a hearing
aid mee
ts
the M2 le
ve
l r
ating
and the wir
ele
ss phone mee
ts
the M3 le
ve
l r
ating, the sum of
the t
w
o v
alue
s equal M5. This
should pr
ovide the hearing aid
user with “normal usage” while
using their hearing aid with the
par
ticular wir
ele
ss phone.
“Normal usage” in this cont
ext is
defined a
s a signal qualit
y tha
t’s
accep
table for normal oper
ation.
The M mark is int
ended t
o be
synon
ymous with the U mark.
The T mark is int
ended t
o be
synon
ymous with the UT mark.
The M and T marks ar
e
