M
‐
Rating:
Phones
rated
M3
or
M4
meet
FCC
requirements
and
are
likely
to
generate
less
interference
with
hearing
devices
than
phone
that
are
not
labeled.
M4
is
the
better/higher
of
the
two
ratings.
(SL5550)
is
rated
M4.
T
‐
Rating:
Phones
rated
T3
or
T4
meet
FCC
requirements
and
are
likely
be
more
usable
with
hearing
devices’
telecoil
than
unrated
phones.
T4
is
the
better/higher
of
the
two
ratings.
(SL5550)
is
rated
T3.
The
more
immune
the
hearing
aid
device
is,
the
less
likely
one
is
to
experience
interference
noise
from
the
wireless
phone.
Hearing
aid
devices
may
also
be
rated.
Adding
the
rating
of
the
hearing
aid
and
the
phone
would
determine
probable
usability:
1.
Any
combined
rating
equal
to
or
greater
than
six
offers
the
best
use.
2.
Any
combined
rating
equal
to
five
is
considered
normal
use.
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
this
device
successfully.
Trying
out
this
device
with
your
hearing
device
is
the
best
way
to
evaluate
it
for
your
personal
needs.
This
device
has
been
tested
and
rated
for
use
with
hearing
aids
for
some
of
the
wireless
technologies
that
it
utilizes.
However,
there
may
be
some
newer
wireless
technologies
used
in
this
phone
that
have
not
been
tested
yet
for
use
with
hearing
aids.
It
is
important
to
try
the
different
features
of
this
phone
thoroughly
and
in
different
locations,
using
your
hearing
aid
or
cochlear
implant,
to
determine
if
you
hear
any
interfering
noise.
Consult
your
service
provider
or
the
manufacturer
of
this
phone
for
information
on
hearing
aid
compatibility.
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
