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OPERATING
MANUAL
K490
NC
( 1 )
On/Off
button
(2)
Charge control light
(3)
Operating
control
light
(4)
Combined
charging/audio
socket
(5)
Charging cable
(6)
Audio cable
(7)
Flight
adaptor
(8)
Carrying
case
START-UP
Please
charge your K490
NC
before using
it
for
the
first
time.
CHARGING
Please
connect
the
charging
cable (
5)
to the
joint
charging/audio socket
(4)
as
well
as to a
free
USB
socket
on
your
computer
or
a
USB
power
adaptor
(not
supplied). The
red
charge
cont
r
ol
light (
2)
indicates the charging process.
It goes out when the
K490
NC
is
fully
charged. The
charging
process
usually
takes
between
1.5 and 3
hours
.
It
is
not
possible to listen and
charge
at
the
same time.
However. during charging you can continue
to
use
the sound cancelling function.
We
recommend
that
you
store
the K490
NC
charged. when it
is
not
in
use
for
longer periods.
AUDIO
PLAYBACK
Connect
the aud
io
cable
to th
e sock
et
( 4) and
connect
the
other
end
with
the
earphones of
your
audio s
our
ce.
NOISE
CANCELLING
FUNCTION
Switch
On
/
Off
button (
1)
to
po
sition "NC" and place
the K490
NC
on your head.
If
necess ary, adjust
the
earpieces as needed.
The
K490 NC
does not need t o
be adjusted
fu
r
ther
.
You
can
al
so use the K490
NC
without audio source and audio cable to cancel sound.
EN
The
operating control light (
3),
which is gr
ee
n when
in
use, also indicates the charge
l
eve
l.
It
star
ts
to
flash when the charge is low. When the c
ha
r
ge
is not
sufficient
for
the sound cance
ll
ing functi
on
and the
operating control light ( 3) goes off,
you
can continue
to use the K490
NC
for
audio playback without losing
sound quality by switching
off
the
on/off
button (
1)
IN
THE
AIRCRAFT
Please
use the
aircraft
adaptor suppli
ed
:
Th
is ai
rcra
ft
adaptor
reduces the sens
it
iv
it y
of
yo
ur earpiece
to
adjust
it
better
to the typically predomi
nant
output.
which
occurs
in
aircraft.
This reduces the
vo
lume
difference
between
on-board
ent
e
rtain
m
ent
programmes
and announcements
from
the cockpit.
for
instance.
NOTES
Do
not
use
the
headphones in
part
i
cularly
high
t
emperatures
(for
i
nstance
in
st
rong
sunli
ght
or
in vehic les when
there
are
extr emely high
temperatures
.
for
i
nstance)
n
or
expose
it
to
we
t
conditions.
Do
not
use
the
headphones when
the
battery
is faulty (leakage,
smell.
warmth
when
switched
of
f )
or
when there a
re
other defec
ts
.
Do
not open
or
modify the
earph
ones und
er
any
circumstances. Store
it
o
ut
of
r each
of
children. as
small
pieces can
be
swallowed or br eathed
in
. Use
the unit only with the cables supp
li
ed
. T
he
r e can
be
di
ff
erences in volume between pur e audio
pl
ay
ba
ck
and combined audio/ sound can c
el
ling function,
depending
on
the o
utput
of
your au
di
o equipment.