<s>
Apple	O
Watch	O
is	O
a	O
line	O
of	O
smartwatches	B-Application
produced	O
by	O
Apple	O
Inc	O
.	O
</s>
<s>
It	O
incorporates	O
fitness	B-Device
tracking	I-Device
,	O
health-oriented	B-Application
capabilities	I-Application
,	O
and	O
wireless	O
telecommunication	O
,	O
and	O
integrates	O
with	O
iOS	B-Application
and	O
other	O
Apple	O
products	O
and	O
services	O
.	O
</s>
<s>
The	O
Apple	O
Watch	O
was	O
released	O
in	O
April	O
2015	O
,	O
and	O
quickly	O
became	O
the	O
best-selling	O
wearable	B-Operating_System
device	I-Operating_System
:	O
4.2	O
million	O
were	O
sold	O
in	O
the	O
second	O
quarter	O
of	O
fiscal	O
2015	O
,	O
and	O
more	O
than	O
101	O
million	O
people	O
were	O
estimated	O
to	O
use	O
an	O
Apple	O
Watch	O
as	O
of	O
December	O
2020	O
.	O
</s>
<s>
The	O
Apple	O
Watch	O
operates	O
in	O
conjunction	O
with	O
the	O
user	O
's	O
iPhone	B-Operating_System
for	O
functions	O
such	O
as	O
configuring	O
the	O
watch	O
and	O
syncing	O
data	O
with	O
iPhone	B-Operating_System
apps	O
,	O
but	O
can	O
separately	O
connect	O
to	O
a	O
Wi-Fi	O
network	O
for	O
data-reliant	O
purposes	O
,	O
including	O
communications	O
,	O
app	O
use	O
,	O
and	O
audio	O
streaming	O
.	O
</s>
<s>
LTE-equipped	O
models	O
can	O
also	O
perform	O
these	O
functions	O
over	O
a	O
mobile	O
network	O
,	O
and	O
can	O
make	O
and	O
receive	O
phone	O
calls	O
independently	O
when	O
the	O
paired	O
iPhone	B-Operating_System
is	O
not	O
nearby	O
or	O
is	O
powered-off	O
,	O
substantially	O
reducing	O
the	O
need	O
for	O
an	O
iPhone	B-Operating_System
after	O
initial	O
setup	O
.	O
</s>
<s>
The	O
oldest	O
iPhone	B-Operating_System
model	O
that	O
is	O
compatible	O
with	O
any	O
given	O
Apple	O
Watch	O
depends	O
on	O
the	O
version	O
of	O
system	B-Application
software	I-Application
installed	O
on	O
each	O
device	O
.	O
</s>
<s>
,	O
new	O
Apple	O
Watches	O
come	O
with	O
watchOS	B-Device
9	O
preinstalled	O
and	O
require	O
an	O
iPhone	B-Operating_System
running	O
iOS	B-Operating_System
16	I-Operating_System
,	O
which	O
is	O
available	O
for	O
the	O
iPhone	B-Operating_System
8	I-Operating_System
and	O
later	O
.	O
</s>
<s>
The	O
goal	O
of	O
the	O
Apple	O
Watch	O
was	O
to	O
complement	O
an	O
iPhone	B-Operating_System
and	O
add	O
new	O
functions	O
,	O
and	O
to	O
free	O
people	O
from	O
their	O
phones	O
.	O
</s>
<s>
Kevin	O
Lynch	O
was	O
hired	O
by	O
Apple	O
to	O
make	O
wearable	B-Operating_System
technology	I-Operating_System
for	O
the	O
wrist	O
.	O
</s>
<s>
Rumors	O
as	O
far	O
back	O
as	O
2011	O
speculated	O
that	O
Apple	O
was	O
developing	O
a	O
wearable	B-Operating_System
variation	O
of	O
the	B-Device
iPod	I-Device
that	O
would	O
curve	O
around	O
the	O
user	O
's	O
wrist	O
,	O
and	O
feature	O
Siri	B-Application
integration	O
.	O
</s>
<s>
In	O
February	O
2013	O
,	O
The	O
New	O
York	O
Times	O
and	O
The	O
Wall	O
Street	O
Journal	O
reported	O
that	O
Apple	O
was	O
beginning	O
to	O
develop	O
an	O
iOS-based	O
smartwatch	B-Application
with	O
a	O
curved	O
display	O
.	O
</s>
<s>
That	O
same	O
month	O
,	O
Bloomberg	O
reported	O
that	O
Apple	O
's	O
smartwatch	B-Application
project	O
was	O
"	O
beyond	O
the	O
experimentation	O
phase	O
"	O
with	O
a	O
team	O
of	O
about	O
100	O
designers	O
.	O
</s>
<s>
In	O
July	O
2013	O
,	O
Financial	O
Times	O
reported	O
that	O
Apple	O
had	O
begun	O
hiring	O
more	O
employees	O
to	O
work	O
on	O
the	O
smartwatch	B-Application
,	O
and	O
that	O
it	O
was	O
targeting	O
a	O
retail	O
release	O
in	O
late	O
2014	O
.	O
</s>
<s>
During	O
a	O
September	O
2014	O
press	O
event	O
where	O
the	O
iPhone	B-Operating_System
6	I-Operating_System
was	O
also	O
presented	O
,	O
the	O
new	O
watch	O
product	O
was	O
introduced	O
by	O
Tim	O
Cook	O
.	O
</s>
<s>
In	O
comparison	O
to	O
other	O
Apple	O
products	O
and	O
competing	O
smartwatches	B-Application
,	O
marketing	O
of	O
the	O
Apple	O
Watch	O
promoted	O
the	O
device	O
as	O
a	O
fashion	O
accessory	O
.	O
</s>
<s>
Apple	O
later	O
focused	O
on	O
its	O
health	O
and	O
fitness-oriented	O
features	O
,	O
in	O
an	O
effort	O
to	O
compete	O
with	O
dedicated	O
activity	B-Device
trackers	I-Device
.	O
</s>
<s>
The	O
watchOS	B-Device
3	O
added	O
fitness	B-Device
tracking	I-Device
for	O
wheelchair	O
users	O
,	O
social	O
sharing	O
in	O
the	O
Activity	B-Application
app	O
,	O
and	O
a	O
Breathe	B-Application
app	O
to	O
facilitate	O
mindfulness	B-Application
.	O
</s>
<s>
The	O
device	O
was	O
not	O
branded	O
as	O
"	O
iWatch	O
"	O
,	O
which	O
would	O
have	O
put	O
it	O
in	O
line	O
with	O
its	O
product	O
lines	O
such	O
as	O
iPod	B-Operating_System
,	O
iPhone	B-Operating_System
,	O
and	O
iPad	B-Device
.	O
</s>
<s>
In	O
July	O
2015	O
,	O
Probendi	O
sued	O
Apple	O
Inc	O
.	O
for	O
trademark	O
infringement	O
,	O
arguing	O
that	O
through	O
keyword	O
advertising	O
on	O
the	O
Google	B-Application
search	I-Application
engine	I-Application
,	O
it	O
caused	O
advertising	O
for	O
the	O
Apple	O
Watch	O
to	O
appear	O
on	O
search	O
results	O
pages	O
when	O
users	O
searched	O
for	O
the	O
trademarked	O
term	O
"	O
iWatch	O
"	O
.	O
</s>
<s>
Next	O
to	O
the	O
crown	O
(	O
on	O
the	O
same	O
side	O
of	O
the	O
watch	O
)	O
is	O
the	O
Side	O
Button	O
,	O
which	O
can	O
be	O
used	O
to	O
display	O
recently	O
used	O
apps	O
and	O
access	O
Apple	B-Application
Pay	I-Application
,	O
which	O
is	O
used	O
for	O
contactless	O
payment	O
.	O
</s>
<s>
The	O
Watch	O
also	O
prominently	O
features	O
a	O
touchscreen	B-Device
;	O
prior	O
to	O
Series	O
6/SE	O
,	O
the	O
screen	O
included	O
Force	B-Device
Touch	I-Device
technology	O
,	O
which	O
enabled	O
the	O
display	O
to	O
become	O
pressure-sensitive	O
and	O
therefore	O
capable	O
of	O
distinguishing	O
between	O
a	O
tap	O
and	O
a	O
press	O
for	O
displaying	O
contextual	O
menus	O
.	O
</s>
<s>
Force	B-Device
Touch	I-Device
has	O
since	O
been	O
physically	O
removed	O
in	O
Watch	O
Series	O
6	O
and	O
Watch	O
SE	O
,	O
and	O
has	O
been	O
disabled	O
via	O
software	O
on	O
Watch	O
Series	O
5	O
and	O
earlier	O
on	O
models	O
supporting	O
watchOS	B-Device
7	O
.	O
</s>
<s>
Additional	O
sensors	O
integrated	O
into	O
the	O
Watch	O
include	O
an	O
accelerometer	O
,	O
gyroscope	B-Application
,	O
and	O
barometer	O
,	O
which	O
are	O
used	O
to	O
determine	O
device	O
orientation	O
,	O
user	O
movement	O
,	O
and	O
altitude	O
.	O
</s>
<s>
Starting	O
with	O
the	O
Series	O
4	O
,	O
Apple	O
added	O
electrical	O
sensors	O
to	O
the	O
Digital	O
Crown	O
and	O
back	O
,	O
allowing	O
the	O
Watch	O
to	O
take	O
electrocardiogram	B-Application
(	O
ECG	B-Application
)	O
readings	O
;	O
the	O
device	O
won	O
FDA	O
clearance	O
in	O
October	O
2018	O
,	O
becoming	O
the	O
first	O
consumer	O
device	O
capable	O
of	O
taking	O
an	O
ECG	B-Application
.	O
</s>
<s>
Apple	O
Watch	O
is	O
charged	O
by	O
means	O
of	O
inductive	B-Application
charging	I-Application
.	O
</s>
<s>
The	O
1st	O
generation	O
Apple	O
Watch	O
(	O
colloquially	O
referred	O
to	O
as	O
Series	O
0	O
)	O
uses	O
the	O
single-core	O
S1	B-Device
system-on-chip	B-Architecture
.	O
</s>
<s>
It	O
does	O
not	O
have	O
a	O
built-in	O
GPS	O
chip	O
,	O
instead	O
relying	O
on	O
a	O
paired	O
iPhone	B-Operating_System
for	O
location	O
services	O
.	O
</s>
<s>
It	O
features	O
a	O
new	O
linear	B-Algorithm
actuator	I-Algorithm
hardware	O
from	O
Apple	O
called	O
the	O
"	O
Taptic	O
Engine	O
"	O
,	O
providing	O
realistic	O
haptic	B-Device
feedback	I-Device
when	O
an	O
alert	O
or	O
a	O
notification	O
is	O
received	O
,	O
and	O
is	O
used	O
for	O
other	O
purposes	O
by	O
certain	O
apps	O
.	O
</s>
<s>
All	O
versions	O
of	O
the	O
first-generation	O
Apple	O
Watch	O
have	O
8	O
GB	O
of	O
storage	O
;	O
the	O
operating	O
system	O
allows	O
the	O
user	O
to	O
store	O
up	O
to	O
2GB	O
of	O
music	B-Operating_System
and	O
75	O
MB	O
of	O
photos	B-Application
.	O
</s>
<s>
When	O
the	O
Apple	O
Watch	O
is	O
paired	O
with	O
an	O
iPhone	B-Operating_System
,	O
all	O
music	B-Operating_System
on	O
that	O
iPhone	B-Operating_System
is	O
also	O
available	O
to	O
be	O
controlled	O
and	O
accessed	O
from	O
the	O
Apple	O
Watch	O
.	O
</s>
<s>
Software	O
support	O
for	O
the	O
first	O
Apple	O
Watch	O
ended	O
with	O
watchOS	B-Device
4.3.2	O
.	O
</s>
<s>
The	O
Series	O
1	O
has	O
a	O
variant	O
of	O
the	O
dual-core	O
Apple	B-Device
S2	I-Device
processor	O
with	O
GPS	O
removed	O
,	O
known	O
as	O
the	O
Apple	O
S1P	O
.	O
</s>
<s>
The	O
Series	O
2	O
has	O
the	O
dual-core	O
Apple	B-Device
S2	I-Device
processor	O
,	O
water	O
resistance	O
to	O
50	O
meters	O
,	O
a	O
display	O
twice	O
as	O
bright	O
,	O
at	O
1000	O
nits	O
,	O
and	O
a	O
GPS	O
receiver	O
.	O
</s>
<s>
The	O
software	O
support	O
for	O
both	O
Apple	O
Watch	O
Series	O
1	O
and	O
Apple	O
Watch	O
Series	O
2	O
ended	O
with	O
watchOS	B-Device
6.3	O
.	O
</s>
<s>
The	O
Apple	O
Watch	O
Series	O
3	O
features	O
a	O
faster	O
processor	O
,	O
the	O
dual-core	O
S3	O
,	O
Bluetooth	B-Protocol
4.2	O
(	O
compared	O
to	O
4.0	O
on	O
older	O
models	O
)	O
,	O
a	O
built-in	O
altimeter	O
for	O
measuring	O
flights	O
of	O
stairs	O
climbed	O
,	O
increased	O
RAM	B-Architecture
size	O
,	O
and	O
is	O
available	O
in	O
a	O
variant	O
with	O
LTE	O
cellular	O
connectivity	O
.	O
</s>
<s>
Siri	B-Application
is	O
able	O
to	O
speak	O
through	O
the	O
onboard	O
speaker	O
on	O
Apple	O
Watch	O
Series	O
3	O
due	O
to	O
the	O
increased	O
processing	O
speed	O
of	O
the	O
Watch	O
.	O
</s>
<s>
Series	O
3	O
features	O
LTE	O
cellular	O
connectivity	O
for	O
the	O
first	O
time	O
in	O
an	O
Apple	O
Watch	O
,	O
enabling	O
users	O
to	O
make	O
phone	O
calls	O
,	O
iMessage	O
and	O
stream	O
Apple	B-Operating_System
Music	I-Operating_System
and	O
Podcasts	B-Operating_System
directly	O
on	O
the	O
watch	O
,	O
independent	O
of	O
an	O
iPhone	B-Operating_System
.	O
</s>
<s>
The	O
LTE	O
model	O
contains	O
an	O
eSIM	O
and	O
shares	O
the	O
same	O
mobile	O
number	O
as	O
the	O
user	O
's	O
iPhone	B-Operating_System
.	O
</s>
<s>
The	O
Apple	O
Watch	O
Series	O
3	O
is	O
the	O
first	O
Apple	O
Watch	O
model	O
to	O
add	O
the	O
new	O
Gold	O
aluminum	O
case	O
color	O
option	O
to	O
match	O
the	O
color	O
introduced	O
with	O
the	O
iPhone	B-Operating_System
8	I-Operating_System
in	O
2017	O
.	O
</s>
<s>
The	O
software	O
support	O
for	O
the	O
Apple	O
Watch	O
Series	O
3	O
ended	O
with	O
watchOS	B-Device
8.7.1	O
.	O
</s>
<s>
Other	O
changes	O
include	O
the	O
digital	O
crown	O
incorporating	O
haptic	B-Device
feedback	I-Device
with	O
the	O
Apple	O
Haptic	O
Engine	O
and	O
includes	O
the	O
new	O
Apple-designed	O
W3	O
wireless	O
chip	O
.	O
</s>
<s>
The	O
ECG	B-Application
system	O
has	O
received	O
clearance	O
from	O
the	O
United	O
States	O
Food	O
and	O
Drug	O
Administration	O
,	O
a	O
first	O
ever	O
for	O
a	O
consumer	O
device	O
,	O
and	O
is	O
supported	O
by	O
the	O
American	O
Heart	O
Association	O
.	O
</s>
<s>
TechRadar	O
gave	O
it	O
a	O
score	O
of	O
4.5/5	O
,	O
calling	O
it	O
one	O
of	O
the	O
top	O
smartwatches	B-Application
,	O
while	O
criticizing	O
the	O
short	O
battery	O
life	O
.	O
</s>
<s>
CNET	O
gave	O
it	O
a	O
score	O
of	O
8.2/10	O
,	O
calling	O
it	O
the	O
"	O
best	O
overall	O
smartwatch	B-Application
around	O
"	O
,	O
while	O
criticizing	O
the	O
battery	O
life	O
and	O
lack	O
of	O
watch	O
face	O
options	O
.	O
</s>
<s>
T3	O
gave	O
it	O
a	O
score	O
of	O
5/5	O
,	O
calling	O
it	O
a	O
"	O
truly	O
next-gen	O
smartwatch	B-Application
"	O
due	O
to	O
its	O
thinner	O
body	O
and	O
bigger	O
screen	O
compared	O
to	O
the	O
Series	O
3	O
,	O
and	O
health	O
features	O
.	O
</s>
<s>
The	O
Apple	O
Series	O
4	O
is	O
the	O
first	O
Apple	O
Watch	O
model	O
to	O
add	O
the	O
new	O
Gold	O
stainless	O
steel	O
color	O
option	O
to	O
match	O
the	O
color	O
introduced	O
with	O
the	O
iPhone	B-Operating_System
XS	I-Operating_System
in	O
2018	O
.	O
</s>
<s>
Its	O
principal	O
improvements	O
over	O
its	O
predecessor	O
were	O
the	O
addition	O
of	O
a	O
compass	B-Language
and	O
an	O
always-on	B-Application
display	I-Application
with	O
a	O
low-power	O
display	O
driver	O
capable	O
of	O
refresh	O
rates	O
as	O
low	O
as	O
once	O
per	O
second	O
.	O
</s>
<s>
second	O
)	O
generation	O
optical	O
heart	O
rate	O
sensor	O
;	O
does	O
not	O
include	O
ECG	B-Application
and	O
blood	O
oximeter	O
sensors	O
or	O
an	O
always-on	B-Application
display	I-Application
;	O
and	O
does	O
not	O
include	O
UWB	O
or	O
5GHz	O
Wi-Fi	O
communication	O
capabilities	O
.	O
</s>
<s>
CNET	O
gave	O
it	O
a	O
score	O
of	O
4/5	O
,	O
concluding	O
,	O
"	O
The	O
Apple	O
Watch	O
continues	O
to	O
be	O
one	O
of	O
the	O
best	O
smartwatches	B-Application
,	O
but	O
it	O
remains	O
limited	O
by	O
being	O
an	O
iPhone	B-Operating_System
accessory	O
for	O
now.	O
"	O
</s>
<s>
The	O
1st-generation	O
Apple	O
Watch	O
SE	O
is	O
the	O
final	O
Apple	O
Watch	O
model	O
available	O
with	O
Space	O
Gray	O
and	O
Gold	O
(	O
introduced	O
with	O
iPhone	B-Operating_System
8	I-Operating_System
in	O
2017	O
)	O
case	O
color	O
options	O
.	O
</s>
<s>
The	O
Apple	B-Device
Watch	I-Device
Series	I-Device
6	I-Device
was	O
announced	O
on	O
September	O
15	O
,	O
2020	O
,	O
during	O
an	O
Apple	O
Special	O
Event	O
and	O
began	O
shipping	O
on	O
September	O
18	O
.	O
</s>
<s>
Additional	O
features	O
include	O
a	O
new	O
S6	O
processor	O
that	O
is	O
up	O
to	O
20%	O
faster	O
than	O
the	O
S4	O
and	O
S5	O
,	O
a	O
2.5	O
×	O
brighter	O
always-on	B-Application
display	I-Application
,	O
and	O
an	O
always-on	O
altimeter	O
.	O
</s>
<s>
Force	B-Device
Touch	I-Device
hardware	O
was	O
removed	O
,	O
consistent	O
with	O
the	O
removal	O
of	O
all	O
Force	B-Device
Touch	I-Device
functionality	O
from	O
watchOS	B-Device
7	O
.	O
</s>
<s>
The	O
Apple	B-Device
Watch	I-Device
Series	I-Device
6	I-Device
is	O
the	O
final	O
Apple	O
Watch	O
model	O
available	O
with	O
Space	O
Gray	O
and	O
Gold	O
(	O
introduced	O
with	O
the	O
iPhone	B-Operating_System
8	I-Operating_System
in	O
2017	O
)	O
aluminum	O
case	O
color	O
options	O
.	O
</s>
<s>
The	O
Gold	O
stainless	O
steel	O
case	O
color	O
option	O
is	O
now	O
in	O
classic	O
yellow	O
gold	O
and	O
the	O
Graphite	O
stainless	O
steel	O
case	O
color	O
option	O
is	O
the	O
new	O
color	O
replacing	O
Space	O
Black	O
color	O
before	O
the	O
introduction	O
with	O
the	O
iPhone	B-Operating_System
12	I-Operating_System
Pro	I-Operating_System
in	O
2020	O
.	O
</s>
<s>
The	O
Apple	O
Watch	O
Series	O
7	O
is	O
now	O
available	O
in	O
Midnight	O
,	O
Starlight	O
,	O
Blue	O
,	O
Green	O
and	O
Product	O
Red	O
aluminum	O
case	O
color	O
option	O
,	O
available	O
in	O
Graphite	O
,	O
Silver	O
and	O
Gold	O
(	O
introduced	O
with	O
the	O
Apple	B-Device
Watch	I-Device
Series	I-Device
6	I-Device
and	O
the	O
iPhone	B-Operating_System
12	I-Operating_System
Pro	I-Operating_System
in	O
2020	O
)	O
stainless	O
steel	O
case	O
color	O
option	O
.	O
</s>
<s>
Both	O
Space	O
Gray	O
and	O
Gold	O
(	O
introduced	O
with	O
iPhone	B-Operating_System
8	I-Operating_System
in	O
2017	O
)	O
aluminum	O
case	O
color	O
options	O
have	O
been	O
removed	O
.	O
</s>
<s>
Enhancements	O
in	O
the	O
Series	O
8	O
,	O
relative	O
to	O
the	O
prior-generation	O
Series	O
7	O
watch	O
,	O
include	O
a	O
new	O
temperature	O
sensor	O
and	O
more	O
precise	O
accelerometers	O
and	O
gyroscopes	B-Application
capable	O
of	O
detecting	O
the	O
occurrence	O
of	O
a	O
car	O
crash	O
.	O
</s>
<s>
Apple	O
Watch	O
runs	O
watchOS	B-Device
,	O
whose	O
interface	O
is	O
based	O
around	O
a	O
home	O
screen	O
with	O
circular	O
app	O
icons	O
,	O
which	O
can	O
be	O
changed	O
to	O
a	O
list	O
view	O
in	O
the	O
devices	O
settings	O
.	O
</s>
<s>
The	O
OS	O
can	O
be	O
navigated	O
using	O
the	O
touchscreen	B-Device
or	O
the	O
crown	O
on	O
the	O
side	O
of	O
the	O
watch	O
.	O
</s>
<s>
During	O
its	O
debut	O
,	O
the	O
first	O
generation	O
Apple	O
Watch	O
needed	O
to	O
be	O
paired	O
with	O
an	O
iPhone	B-Operating_System
5	I-Operating_System
or	O
later	O
running	O
iOS	B-Operating_System
8.2	I-Operating_System
or	O
later	O
;	O
this	O
version	O
of	O
iOS	B-Application
introduced	O
the	O
Apple	O
Watch	O
app	O
,	O
which	O
is	O
used	O
to	O
pair	O
the	O
watch	O
with	O
an	O
iPhone	B-Operating_System
,	O
customize	O
settings	O
and	O
loaded	O
apps	O
,	O
and	O
highlight	O
compatible	O
apps	O
from	O
the	O
App	O
Store	O
.	O
</s>
<s>
The	O
Apple	O
Watch	O
is	O
capable	O
of	O
receiving	O
notifications	O
,	O
messages	O
,	O
and	O
phone	O
calls	O
via	O
a	O
paired	O
iPhone	B-Operating_System
.	O
</s>
<s>
"	O
Glances	O
"	O
allowed	O
users	O
to	O
swipe	O
between	O
pages	O
containing	O
widget-like	B-Application
displays	O
of	O
information	O
;	O
however	O
,	O
this	O
feature	O
was	O
replaced	O
by	O
a	O
new	O
Control	O
Center	O
.	O
</s>
<s>
watchOS	B-Device
also	O
supports	O
Handoff	O
to	O
send	O
content	O
from	O
Apple	O
Watch	O
to	O
an	O
iOS	B-Application
or	O
macOS	B-Application
device	O
,	O
and	O
act	O
as	O
a	O
viewfinder	B-Algorithm
for	O
an	O
iPhone	B-Operating_System
camera	O
,	O
Siri	B-Application
is	O
also	O
available	O
for	O
voice	O
commands	O
,	O
and	O
is	O
capable	O
of	O
responding	O
with	O
voice	O
prompts	O
on	O
the	O
Series	O
3	O
watches	O
.	O
</s>
<s>
Apple	O
Watch	O
also	O
supports	O
Apple	B-Application
Pay	I-Application
,	O
and	O
enables	O
its	O
use	O
with	O
older	O
iPhone	B-Operating_System
models	O
that	O
do	O
not	O
contain	O
near-field	O
communication	O
(	O
NFC	O
)	O
support	O
.	O
</s>
<s>
Apple	O
Watch	O
's	O
default	O
apps	O
are	O
designed	O
to	O
interact	O
with	O
their	O
iOS	B-Application
counterparts	O
,	O
such	O
as	O
Mail	B-Operating_System
,	O
Phone	O
,	O
Calendar	B-Operating_System
,	O
Messages	O
,	O
Maps	B-Application
,	O
Music	B-Operating_System
,	O
Photos	B-Application
,	O
Reminders	B-Application
,	O
Remote	O
(	O
which	O
can	O
control	O
iTunes	B-Operating_System
and	O
Apple	B-Device
TV	I-Device
)	O
,	O
Stocks	O
,	O
and	O
Wallet	B-Operating_System
.	O
</s>
<s>
Using	O
the	O
Activity	B-Application
and	O
Workout	O
apps	O
,	O
a	O
user	O
can	O
track	O
their	O
physical	O
activity	B-Application
and	O
send	O
data	O
back	O
to	O
the	O
iPhone	B-Operating_System
for	O
use	O
in	O
its	O
Health	O
app	O
and	O
other	O
HealthKit-enabled	O
software	O
.	O
</s>
<s>
With	O
watchOS	B-Device
3	O
,	O
Reminders	B-Application
,	O
Home	O
,	O
Find	O
My	O
Friends	O
,	O
Heart	O
Rate	O
,	O
and	O
Breathe	B-Application
were	O
added	O
to	O
the	O
stock	O
apps	O
.	O
</s>
<s>
At	O
WWDC	O
2015	O
,	O
Tim	O
Cook	O
announced	O
watchOS	B-Device
2.0	O
;	O
described	O
by	O
CNET	O
as	O
a	O
"	O
significant	O
revamp	O
"	O
,	O
it	O
included	O
a	O
new	O
software	B-Application
development	I-Application
kit	I-Application
that	O
allows	O
more	O
direct	O
access	O
to	O
the	O
device	O
's	O
hardware	O
,	O
new	O
watch	O
faces	O
,	O
the	O
ability	O
to	O
reply	O
to	O
an	O
e-mail	O
,	O
and	O
other	O
features	O
.	O
</s>
<s>
WatchOS	B-Device
2.0	O
was	O
released	O
in	O
September	O
2015	O
.	O
</s>
<s>
watchOS	B-Device
3.0	O
was	O
announced	O
at	O
WWDC	O
2016	O
,	O
with	O
a	O
priority	O
on	O
performance	O
.	O
</s>
<s>
Another	O
feature	O
is	O
Activity	B-Application
Sharing	O
,	O
which	O
allows	O
sharing	O
of	O
workouts	O
with	O
friends	O
and	O
even	O
sending	O
their	O
heartbeats	O
to	O
one	O
another	O
.	O
</s>
<s>
A	O
new	O
app	O
called	O
Breathe	B-Application
guides	O
users	O
through	O
breathing	O
exercises	O
throughout	O
the	O
day	O
,	O
with	O
visuals	O
and	O
haptic	B-Device
feedback	I-Device
.	O
</s>
<s>
watchOS	B-Device
3.1	O
was	O
released	O
to	O
the	O
public	O
in	O
October	O
2016	O
,	O
and	O
watchOS	B-Device
3.2	O
was	O
released	O
in	O
March	O
2017	O
.	O
</s>
<s>
WatchOS	B-Device
4.0	O
was	O
announced	O
at	O
WWDC	O
2017	O
and	O
released	O
to	O
the	O
public	O
in	O
September	O
2017	O
.	O
</s>
<s>
WatchOS	B-Device
4	O
features	O
a	O
proactive	O
Siri	B-Application
watch	O
face	O
,	O
personalized	O
activity	B-Application
coaching	O
,	O
and	O
an	O
entirely	O
redesigned	O
music	B-Operating_System
app	O
.	O
</s>
<s>
WatchOS	B-Device
4.3	O
was	O
released	O
in	O
March	O
2018	O
.	O
</s>
<s>
It	O
brought	O
back	O
the	O
ability	O
for	O
music	B-Operating_System
playing	O
on	O
the	O
iPhone	B-Operating_System
to	O
be	O
controlled	O
using	O
the	O
Music	B-Operating_System
app	O
on	O
the	O
Apple	O
Watch	O
and	O
also	O
enabled	O
control	O
of	O
playback	O
and	O
volume	O
on	O
Apple	O
's	O
HomePod	O
.	O
</s>
<s>
Activity	B-Application
data	O
was	O
added	O
to	O
the	O
Siri	B-Application
watch	O
face	O
,	O
and	O
the	O
battery	O
complication	O
more	O
accurately	O
reports	O
battery	O
life	O
.	O
</s>
<s>
watchOS	B-Device
5.0	O
was	O
first	O
shown	O
to	O
the	O
public	O
at	O
the	O
San	O
Jose	O
WWDC	O
developer	O
conference	O
held	O
by	O
Apple	O
.	O
</s>
<s>
It	O
introduced	O
an	O
instant	O
watch-to-watch	O
walkie-talkie	B-Application
mode	O
,	O
all-new	O
Podcasts	B-Operating_System
app	O
,	O
raise-wrist-to-speak	O
Siri	B-Application
,	O
customizable	O
Control	O
Center	O
,	O
and	O
the	O
ability	O
to	O
access	O
the	O
notification	O
center	O
and	O
control	O
center	O
from	O
apps	O
.	O
</s>
<s>
On	O
the	O
newest	O
release	O
of	O
watchOS	B-Device
beta	O
the	O
sleep	O
feature	O
was	O
shown	O
on	O
screen	O
,	O
this	O
would	O
eliminate	O
the	O
need	O
to	O
use	O
third-party	O
apps	O
.	O
</s>
<s>
watchOS	B-Device
6.0	O
was	O
released	O
to	O
the	O
public	O
in	O
September	O
2019	O
.	O
</s>
<s>
It	O
introduced	O
more	O
native	O
iOS	B-Application
apps	O
such	O
as	O
voice	O
memos	O
,	O
calculator	O
,	O
and	O
a	O
native	O
watchOS	B-Device
app	O
store	O
.	O
</s>
<s>
watchOS	B-Device
6.0	O
also	O
introduced	O
new	O
features	O
such	O
as	O
the	O
noise	O
app	O
that	O
allows	O
you	O
to	O
measure	O
the	O
sound	O
around	O
you	O
in	O
decibels	O
,	O
menstrual	O
tracking	O
,	O
and	O
new	O
watch	O
faces	O
.	O
</s>
<s>
Other	O
features	O
include	O
Siri	B-Application
being	O
able	O
to	O
tell	O
users	O
what	O
music	B-Operating_System
they	O
are	O
listening	O
to	O
,	O
activity	B-Application
trends	O
,	O
and	O
a	O
new	O
UI	O
framework	O
for	O
developers	O
.	O
</s>
<s>
watchOS	B-Device
7.0	O
was	O
announced	O
on	O
June	O
22	O
,	O
2020	O
,	O
at	O
the	O
WWDC	O
,	O
and	O
released	O
on	O
September	O
16	O
,	O
2020	O
;	O
new	O
functionalities	O
include	O
sleep	O
tracking	O
,	O
additional	O
watch	O
faces	O
,	O
handwashing	O
detection	O
and	O
new	O
workouts	O
such	O
as	O
dancing	O
.	O
</s>
<s>
watchOS	B-Device
8.0	O
was	O
announced	O
on	O
June	O
7	O
,	O
2021	O
,	O
at	O
the	O
WWDC	O
,	O
and	O
released	O
on	O
September	O
20	O
,	O
2021	O
.	O
</s>
<s>
It	O
replaces	O
the	O
Breathe	B-Application
app	O
with	O
a	O
new	O
Mindfulness	B-Application
app	O
,	O
and	O
adds	O
a	O
Focus	O
mode	O
as	O
well	O
as	O
a	O
Portrait	O
Watch	O
Face	O
,	O
updates	O
to	O
the	O
Messages	O
and	O
Home	O
apps	O
,	O
Contacts	O
and	O
Find	O
My	O
apps	O
,	O
and	O
a	O
redesigned	O
Photos	B-Application
app	O
.	O
</s>
<s>
watchOS	B-Device
9.0	O
was	O
released	O
to	O
public	O
on	O
September	O
13	O
,	O
2022	O
.	O
</s>
<s>
It	O
enhances	O
the	O
Workout	O
display	O
with	O
new	O
views	O
of	O
metrics	O
like	O
Activity	B-Application
rings	O
,	O
Heart	O
Rate	O
Zones	O
,	O
Power	O
,	O
and	O
Elevation	O
.	O
</s>
<s>
In	O
watchOS	B-Device
1	O
,	O
third-party	O
WatchKit	B-Device
applications	O
run	O
in	O
the	O
background	O
on	O
the	O
iPhone	B-Operating_System
as	O
an	O
application	O
extension	O
while	O
a	O
set	O
of	O
native	O
user	O
interface	O
resources	O
are	O
installed	O
on	O
Apple	O
Watch	O
.	O
</s>
<s>
Thus	O
,	O
watchOS	B-Device
apps	O
must	O
be	O
bundled	O
within	O
their	O
respective	O
iOS	B-Application
app	O
,	O
and	O
are	O
synced	O
to	O
the	O
watch	O
either	O
manually	O
,	O
or	O
automatically	O
upon	O
installation	O
of	O
the	O
phone	O
app	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
watchOS	B-Device
2	O
,	O
Apple	O
made	O
it	O
mandatory	O
for	O
new	O
watch	O
apps	O
to	O
be	O
developed	O
with	O
the	O
watchOS	B-Device
2	O
SDK	O
from	O
June	O
1	O
,	O
2016	O
,	O
onwards	O
;	O
no	O
third-party	O
languages	O
or	O
SDKs	O
can	O
be	O
used	O
to	O
develop	O
apps	O
.	O
</s>
<s>
In	O
watchOS	B-Device
5	O
and	O
earlier	O
,	O
all	O
watchOS	B-Device
apps	O
are	O
dependent	O
apps	O
–	O
the	O
watchOS	B-Device
app	O
relies	O
on	O
an	O
iOS	B-Application
companion	O
app	O
in	O
order	O
to	O
function	O
properly	O
.	O
</s>
<s>
In	O
watchOS	B-Device
6	O
or	O
later	O
,	O
developers	O
are	O
able	O
to	O
create	O
completely	O
independent	O
watchOS	B-Device
apps	O
,	O
and	O
no	O
longer	O
require	O
an	O
app	O
to	O
be	O
installed	O
on	O
the	O
paired	O
iPhone	B-Operating_System
.	O
</s>
<s>
Evan	O
Dashevsky	O
of	O
PC	O
Magazine	O
said	O
it	O
offered	O
nothing	O
new	O
in	O
terms	O
of	O
functionality	O
compared	O
to	O
the	O
Moto	B-Application
360	I-Application
,	O
except	O
the	O
customizable	O
vibration	O
notifications	O
.	O
</s>
<s>
Farhad	O
Manjoo	O
of	O
The	O
New	O
York	O
Times	O
mentioned	O
the	O
device	O
's	O
steep	O
learning	O
curve	O
,	O
stating	O
it	O
took	O
him	O
"	O
three	O
long	O
,	O
often	O
confusing	O
and	O
frustrating	O
days	O
"	O
to	O
become	O
accustomed	O
to	O
watchOS	B-Device
1	O
,	O
but	O
loved	O
it	O
thereafter	O
.	O
</s>
<s>
Some	O
reviewers	O
also	O
compared	O
it	O
to	O
competing	O
products	O
,	O
such	O
as	O
Android	B-Application
Wear	I-Application
devices	O
,	O
and	O
claimed	O
"	O
The	O
Smartwatch	B-Application
Finally	O
Makes	O
Sense	O
"	O
.	O
</s>
<s>
Reviewers	O
had	O
mixed	O
opinions	O
on	O
battery	O
life	O
though	O
,	O
with	O
Geoffrey	O
Fowler	O
of	O
The	O
Wall	O
Street	O
Journal	O
saying	O
"	O
the	O
battery	O
lives	O
up	O
to	O
its	O
all-day	O
billing	O
,	O
but	O
sometimes	O
just	O
barely	O
,	O
"	O
and	O
others	O
compared	O
it	O
to	O
the	O
Samsung	B-Application
Gear	I-Application
2	I-Application
,	O
which	O
"	O
strolls	O
through	O
three	O
days	O
of	O
moderate	O
usage.	O
"	O
</s>
<s>
In	O
December	O
2019	O
,	O
Joseph	O
Wiesel	O
,	O
a	O
New	O
York	O
University	O
cardiologist	O
,	O
sued	O
Apple	O
over	O
allegations	O
that	O
the	O
Apple	O
Watch	O
violates	O
a	O
patented	O
method	O
for	O
detecting	O
atrial	B-Application
fibrillation	I-Application
.	O
</s>
