<s>
The	O
Samsung	B-Application
Galaxy	I-Application
Watch	I-Application
4	I-Application
(	O
stylized	O
as	O
Samsung	B-Operating_System
Galaxy	I-Operating_System
Watch4	O
)	O
is	O
a	O
smartwatch	B-Application
developed	O
by	O
Samsung	B-Application
Electronics	O
.	O
</s>
<s>
It	O
is	O
the	O
first	O
Samsung	B-Application
watch	O
to	O
run	O
Google	B-Application
's	I-Application
Wear	B-Application
OS	I-Application
since	O
the	O
Samsung	B-Application
Gear	I-Application
Live	I-Application
,	O
and	O
the	O
first	O
watch	O
to	O
run	O
Wear	B-Application
OS	I-Application
3	I-Application
,	O
co-developed	O
by	O
Samsung	B-Application
and	O
Google	B-Application
.	I-Application
</s>
<s>
The	O
device	O
largely	O
followed	O
the	O
design	O
language	O
of	O
the	O
preceding	O
Samsung	B-Operating_System
Galaxy	I-Operating_System
Watch	O
Active	O
and	O
Galaxy	B-Application
Watch	I-Application
3	I-Application
,	O
but	O
including	O
all	O
new	O
software	O
.	O
</s>
<s>
The	O
watch	O
also	O
included	O
EKG	O
,	O
body	O
compositional	O
analysis	O
,	O
and	O
blood	O
pressure	O
monitoring	O
via	O
the	O
new	O
Samsung	B-Application
BioActive	O
sensor	O
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
August	O
11	O
,	O
2021	O
,	O
at	O
Samsung	B-Application
's	I-Application
Unpacked	O
Event	O
alongside	O
the	O
Samsung	B-Application
Galaxy	I-Application
Z	I-Application
Flip	I-Application
3	I-Application
,	O
Samsung	B-Application
Galaxy	I-Application
Z	I-Application
Fold	I-Application
3	I-Application
and	O
Galaxy	B-Application
Buds	I-Application
2	I-Application
.	O
</s>
<s>
The	O
smartwatch	B-Application
was	O
the	O
first	O
watch	O
released	O
by	O
Samsung	B-Application
to	O
use	O
Wear	B-Application
OS	I-Application
instead	O
of	O
Samsung	B-Application
's	I-Application
own	O
Tizen	B-Application
OS	I-Application
.	O
</s>
<s>
This	O
smartwatch	B-Application
is	O
region	O
locked	O
in	O
mainland	O
China	O
,	O
unlike	O
past	O
models	O
.	O
</s>
<s>
Unlike	O
past	O
Wear	B-Application
OS	I-Application
devices	O
,	O
Wear	B-Application
OS	I-Application
3	I-Application
supports	O
a	O
wider	O
variety	O
of	O
languages	O
that	O
the	O
end	O
user	O
can	O
choose	O
from	O
.	O
</s>
