<s>
Bose	O
has	O
sold	O
aviation	B-Device
headsets	I-Device
since	O
1989	O
and	O
consumer	O
headphones	B-Device
since	O
2000	O
.	O
</s>
<s>
The	O
current	O
range	O
of	O
headphones/headsets	O
consists	O
of	O
over-ear	O
,	O
in-ear	O
,	O
aviation	O
and	O
military	O
models	O
.	O
</s>
<s>
Development	O
of	O
the	O
company	O
's	O
noise	O
cancelling	O
headphones	B-Device
(	O
and	O
first	O
over-ear	O
headphones	B-Device
)	O
began	O
in	O
1978	O
when	O
the	O
chairman	O
,	O
Amar	O
Bose	O
,	O
tried	O
a	O
set	O
of	O
airline-supplied	O
headphones	B-Device
during	O
a	O
flight	O
and	O
found	O
that	O
engine	O
noise	O
from	O
the	O
aircraft	O
prevented	O
the	O
music	O
from	O
being	O
enjoyed	O
.	O
</s>
<s>
In	O
1986	O
,	O
Bose	O
and	O
Sennheiser	O
both	O
presented	O
active	O
noise	O
cancelling	O
headsets	B-Device
for	O
aircraft	O
pilots	O
,	O
with	O
the	O
Sennheiser	O
design	O
appearing	O
in	O
a	O
paper	O
and	O
the	O
Bose	O
design	O
appearing	O
in	O
an	O
ASME	O
paper	O
.	O
</s>
<s>
The	O
company	O
was	O
the	O
first	O
to	O
release	O
active	O
noise	O
cancelling	O
headphones	B-Device
as	O
a	O
consumer	O
product	O
.	O
</s>
<s>
In	O
2017	O
,	O
Bose	O
released	O
an	O
updated	O
model	O
known	O
as	O
the	O
QuietComfort	B-Algorithm
35	O
II	O
,	O
which	O
adds	O
a	O
customizable	O
"	O
action	O
"	O
button	O
on	O
the	O
left	O
ear	O
cap	O
.	O
</s>
<s>
By	O
default	O
,	O
it	O
is	O
mapped	O
to	O
activate	O
the	O
Google	B-Application
Assistant	I-Application
,	O
making	O
it	O
the	O
first	O
headphones	B-Device
to	O
integrate	O
with	O
the	O
service	O
.	O
</s>
<s>
In	O
July	O
2019	O
,	O
users	O
began	O
to	O
report	O
that	O
a	O
firmware	B-Application
update	O
to	O
the	O
QC35	O
II	O
had	O
inhibited	O
the	O
performance	O
of	O
the	O
noise	O
cancellation	O
features	O
.	O
</s>
<s>
Bose	O
stated	O
that	O
it	O
had	O
not	O
made	O
any	O
changes	O
to	O
noise	O
cancellation	O
functions	O
in	O
their	O
firmware	B-Application
.	O
</s>
<s>
Some	O
users	O
performed	O
firmware	B-Application
downgrades	O
,	O
but	O
Bose	O
later	O
prevented	O
this	O
for	O
security	O
reasons	O
.	O
</s>
<s>
In	O
2019	O
,	O
Bose	O
released	O
the	O
Noise	O
Cancelling	O
Headphones	B-Device
700	O
,	O
also	O
known	O
as	O
the	O
NCH	O
700	O
,	O
a	O
new	O
high-end	O
product	O
positioned	O
above	O
the	O
QC	O
35	O
.	O
</s>
<s>
The	O
headphones	B-Device
feature	O
a	O
more	O
contemporary	O
design	O
with	O
a	O
stainless	O
steel	O
band	O
and	O
are	O
controlled	O
using	O
a	O
mix	O
of	O
buttons	O
and	O
touch-sensitive	O
areas	O
on	O
the	O
cups	O
.	O
</s>
<s>
The	O
embedded	O
rechargeable	O
battery	O
is	O
not	O
replaceable	O
which	O
limits	O
the	O
lifespan	O
of	O
the	O
headphones	B-Device
to	O
the	O
life	O
of	O
the	O
battery	O
.	O
</s>
<s>
The	O
NCH	O
700	O
can	O
also	O
connect	O
to	O
two	O
devices	O
simultaneously	O
,	O
and	O
integrate	O
with	O
Amazon	B-Application
Alexa	I-Application
and	O
Siri	B-Application
in	O
addition	O
to	O
the	O
Google	B-Application
Assistant	I-Application
.	O
</s>
<s>
In	O
2021	O
,	O
Bose	O
released	O
the	O
Bose	O
QuietComfort	B-Algorithm
45	O
headphones	B-Device
.	O
</s>
<s>
In	O
addition	O
to	O
adding	O
USB-C	O
support	O
to	O
the	O
QuietComfort	B-Algorithm
model	O
,	O
Bose	O
also	O
added	O
a	O
fourth	O
external	O
microphone	O
to	O
improve	O
call	O
quality	O
and	O
Bluetooth	O
5.1	O
to	O
improve	O
wireless	O
range	O
.	O
</s>
<s>
The	O
"	O
QuietComfort	B-Algorithm
20	O
"	O
(	O
QC20	O
)	O
and	O
QC20i	O
in-ear	O
headphones	B-Device
were	O
released	O
in	O
2015	O
and	O
are	O
the	O
company	O
's	O
first	O
in-ear	O
noise	O
cancelling	O
headphones	B-Device
.	O
</s>
<s>
The	O
noise	O
cancelling	O
hardware	O
and	O
micro-USB	O
supported	O
rechargeable	O
battery	O
is	O
contained	O
with	O
a	O
box	O
located	O
near	O
the	O
headphone	B-Device
jack	O
,	O
similar	O
to	O
the	O
.	O
</s>
<s>
The	O
earbuds	O
are	O
similar	O
to	O
the	O
IE2	O
headphones	B-Device
.	O
</s>
<s>
True	B-Device
wireless	I-Device
headphones	I-Device
have	O
no	O
cord	O
to	O
keep	O
each	O
bud	O
connected	O
to	O
each	O
other	O
.	O
</s>
<s>
The	O
QuietComfort	B-Algorithm
Earbuds	O
(	O
QC	O
Earbuds	O
)	O
were	O
released	O
on	O
5	O
October	O
2020	O
.	O
</s>
<s>
The	O
headset	B-Device
features	O
improved	O
noise-cancellation	O
compared	O
to	O
the	O
predecessor	O
QuietComfort	B-Algorithm
(	O
QC	O
)	O
20	O
,	O
coupled	O
with	O
a	O
noise	B-Algorithm
canceling	I-Algorithm
microphone	I-Algorithm
in	O
the	O
right	O
headphone	B-Device
.	O
</s>
<s>
Ear	B-Device
tips	I-Device
:	O
Included	O
ear	B-Device
tip	I-Device
sizes	O
:	O
Small	O
,	O
medium	O
,	O
and	O
large	O
.	O
</s>
<s>
With	O
the	O
proprietary	B-Application
Bose	O
Music	O
app	O
,	O
the	O
QC	O
Earbuds	O
can	O
be	O
customized	O
with	O
touch	O
control	O
to	O
increase/decrease	O
volume	O
by	O
swiping	O
the	O
right	O
in-ear	O
headphone	B-Device
and	O
battery	O
status	O
by	O
double	O
tapping	O
the	O
left	O
in-ear	O
headphone	B-Device
,	O
and	O
default	O
noise	O
cancelling	O
mode	O
when	O
only	O
one	O
headphone	B-Device
is	O
plugged	O
into	O
the	O
ear	O
.	O
</s>
<s>
The	O
settings	O
are	O
stored	O
in	O
the	O
firmware	B-Application
of	O
the	O
headphones	B-Device
,	O
so	O
the	O
app	O
can	O
be	O
uninstalled	O
once	O
they	O
have	O
been	O
configured	O
.	O
</s>
<s>
In	O
September	O
2022	O
,	O
Bose	O
has	O
revealed	O
its	O
new	O
QuietComfort	B-Algorithm
Earbuds	O
II	O
.	O
</s>
<s>
QuietComfort	B-Algorithm
Earbuds	O
II	O
were	O
launched	O
on	O
15	O
September	O
2022	O
.	O
</s>
<s>
The	O
QuietComfort	B-Algorithm
Earbuds	O
II	O
headphones	B-Device
and	O
ear	B-Device
tips	I-Device
are	O
smaller	O
and	O
lighter	O
than	O
the	O
original	O
QuietComfort	B-Algorithm
Earbuds	O
counterparts	O
that	O
they	O
replace	O
.	O
</s>
<s>
Ear	B-Device
tips	I-Device
and	O
stability	O
bands	O
:	O
The	O
product	O
is	O
shipped	O
with	O
three	O
pairs	O
of	O
ear	B-Device
tips	I-Device
(	O
small	O
,	O
medium	O
,	O
and	O
large	O
)	O
,	O
and	O
three	O
pairs	O
of	O
stability	O
bands	O
(	O
size	O
1	O
–	O
3	O
)	O
.	O
</s>
<s>
However	O
,	O
intermediate	O
size	O
extra-small	O
,	O
and	O
extra-large	O
,	O
for	O
the	O
ear	B-Device
tips	I-Device
,	O
as	O
well	O
as	O
size	O
0	O
,	O
and	O
4	O
for	O
the	O
stability	O
bands	O
,	O
can	O
be	O
bought	O
in	O
an	O
Alternate	O
Sizing	O
Kit	O
.	O
</s>
<s>
Default	O
firmware	B-Application
configuration	O
since	O
the	O
predecessor	O
(	O
QuietComfort	B-Algorithm
Earbuds	O
)	O
:	O
</s>
<s>
Award	O
2022	O
as	O
the	O
'	O
Best	O
wireless	B-Device
earbuds	I-Device
over	O
£200	O
 '	O
.	O
</s>
<s>
CNET	O
's	O
Best	O
Wireless	B-Device
Earbuds	I-Device
for	O
2022	O
,	O
as	O
well	O
as	O
a	O
CNET	O
's	O
Editors	O
 '	O
Choice	O
Award	O
of	O
8.8/10	O
points	O
.	O
</s>
<s>
The	O
Sleepbuds	O
II	O
are	O
dependent	O
on	O
the	O
proprietary	B-Application
Bose	O
Sleep	O
app	O
for	O
Android	O
or	O
iOS	O
,	O
which	O
provides	O
ambient	O
sounds	O
and	O
an	O
alarm	O
clock	O
.	O
</s>
<s>
However	O
,	O
some	O
users	O
might	O
find	O
it	O
inconvenient	O
that	O
it	O
is	O
required	O
to	O
manually	O
synchronize	O
the	O
Bose	O
Sleep	O
app	O
with	O
events	O
from	O
other	O
apps	O
to	O
not	O
miss	O
them	O
,	O
as	O
the	O
smartphone	O
speaker	O
will	O
be	O
masked	O
by	O
the	O
headphones	B-Device
that	O
only	O
allow	O
audio	O
permission	O
from	O
the	O
Bose	O
Sleep	O
.	O
</s>
<s>
Sleepbuds	O
II	O
can	O
be	O
used	O
as	O
a	O
tinnitus	B-Application
masker	I-Application
.	O
</s>
<s>
Despite	O
the	O
very	O
small	O
size	O
of	O
the	O
headphones	B-Device
,	O
they	O
may	O
cause	O
pressure	O
pain	O
on	O
the	O
ear	O
for	O
side-sleepers	O
.	O
</s>
<s>
The	O
"	O
A20	O
Aviation	B-Device
Headset	I-Device
"	O
was	O
released	O
in	O
2010	O
as	O
the	O
successor	O
to	O
the	O
"	O
Aviation	B-Device
Headset	I-Device
X	O
"	O
(	O
aka	O
A10	O
)	O
.	O
</s>
<s>
A	O
"	O
Combat	O
Vehicle	O
Crewman	O
Headset	B-Device
"	O
was	O
released	O
in	O
1998	O
,	O
for	O
use	O
in	O
armoured	O
vehicles	O
.	O
</s>
<s>
A	O
"	O
Triport	B-Algorithm
Tactical	O
Headset	B-Device
"	O
(	O
TTH	O
)	O
was	O
released	O
in	O
2004	O
.	O
</s>
<s>
Bose	O
Music	O
is	O
a	O
proprietary	B-Application
mobile	B-Application
app	I-Application
that	O
is	O
required	O
by	O
products	O
including	O
the	O
QuietComfort	B-Algorithm
Earbuds-series	O
(	O
QuietComfort	B-Algorithm
Earbuds	O
II	O
,	O
QuietComfort	B-Algorithm
Earbuds	O
)	O
.	O
</s>
