<s>
Xiaomi	B-Application
Mi	I-Application
MIX	I-Application
is	O
an	O
Android	B-Application
Smartphone	O
manufactured	O
by	O
Xiaomi	O
.	O
</s>
<s>
It	O
was	O
succeeded	O
by	O
the	O
Xiaomi	B-Application
Mi	I-Application
MIX	I-Application
2	I-Application
in	O
September	O
2017	O
,	O
followed	O
by	O
the	O
Xiaomi	B-Application
Mi	I-Application
MIX	I-Application
3	I-Application
on	O
25	O
October	O
2018	O
and	O
the	O
latest	O
Xiaomi	B-Application
MIX	I-Application
4	I-Application
on	O
10	O
August	O
2021	O
.	O
</s>
<s>
The	O
Xiaomi	B-Application
Mi	I-Application
MIX	I-Application
's	O
frame	O
(	O
including	O
the	O
back	O
and	O
side	O
buttons	O
)	O
are	O
made	O
of	O
ceramic	O
.	O
</s>
<s>
The	O
proximity	B-Device
sensor	I-Device
uses	O
ultrasound	O
radar	O
instead	O
of	O
an	O
infrared	O
light	O
.	O
</s>
<s>
The	O
premium	O
version	O
of	O
the	O
model	O
equipped	O
with	O
6GB	O
RAM	B-Architecture
and	O
256GB	O
storage	O
,	O
and	O
made	O
by	O
18k	O
Gold	O
decoration	O
on	O
the	O
back	O
plates	O
.	O
</s>
<s>
Mi	B-Application
MIX	I-Application
is	O
still	O
on	O
official	O
Xiaomi	O
Update	O
all	O
the	O
way	O
till	O
end	O
of	O
year	O
2019	O
,	O
with	O
official	O
MIUI	B-Protocol
11	O
update	O
with	O
full-screen	O
gesture	O
navigation	O
,	O
which	O
made	O
Mi	B-Application
MIX	I-Application
still	O
works	O
elegantly	O
even	O
after	O
3.5	O
years	O
of	O
its	O
initial	O
debut	O
.	O
</s>
