<s>
The	O
HP	B-Application
Slate	I-Application
21	I-Application
is	O
a	O
computer	O
developed	O
by	O
Hewlett-Packard	O
that	O
runs	O
the	O
Android	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
It	O
is	O
described	O
as	O
either	O
an	O
all-in-one	B-Device
desktop	O
computer	O
or	O
a	O
large	O
tablet	B-Device
computer	I-Device
.	O
</s>
<s>
The	O
device	O
uses	O
a	O
21.5-inch	O
touchscreen	B-Device
and	O
a	O
Tegra	B-Operating_System
4	O
processor	O
,	O
but	O
does	O
not	O
include	O
a	O
battery	O
.	O
</s>
<s>
It	O
runs	O
Android	B-Application
Jelly	I-Application
Bean	I-Application
as	O
its	O
operating	O
system	O
.	O
</s>
<s>
It	O
received	O
mixed	O
reviews	O
from	O
critics	O
,	O
with	O
reviewers	O
favoring	O
the	O
screen	O
's	O
wide	O
viewing	O
angles	O
and	O
Full	O
HD	O
resolution	B-General_Concept
,	O
while	O
criticizing	O
the	O
lack	O
of	O
software	O
optimization	O
for	O
the	O
large	O
display	O
.	O
</s>
<s>
The	O
Slate	O
21	O
uses	O
an	O
Nvidia	B-Operating_System
Tegra	I-Operating_System
4	O
system-on-chip	O
running	O
at	O
1.66GHz	O
.	O
</s>
<s>
It	O
includes	O
1	O
GB	O
of	O
DDR3	O
memory	O
and	O
8	O
GB	O
of	O
internal	O
flash	O
storage	O
,	O
which	O
can	O
be	O
expanded	O
via	O
an	O
SD	B-Device
card	I-Device
slot	O
.	O
</s>
<s>
Connectivity	O
support	O
includes	O
three	O
USB	O
2.0	O
ports	O
,	O
a	O
10/100Mbit/s	B-Protocol
Ethernet	I-Protocol
socket	O
,	O
a	O
3.5mm	O
headphone	B-Device
jack	I-Device
,	O
Bluetooth	B-Protocol
3.0	O
,	O
and	O
dual-band	O
802.11	O
n	O
Wi-Fi	O
.	O
</s>
<s>
The	O
Slate	O
21	O
uses	O
a	O
21.5-inch	O
IPS	B-Architecture
panel	I-Architecture
with	O
a	O
resolution	B-General_Concept
of	O
1920×1080	O
.	O
</s>
<s>
It	O
does	O
not	O
include	O
an	O
accelerometer	O
,	O
which	O
meant	O
that	O
any	O
Android	B-Application
games	O
which	O
use	O
accelerometer	O
controls	O
cannot	O
be	O
played	O
.	O
</s>
<s>
The	O
screen	O
has	O
a	O
glossy	B-General_Concept
surface	O
.	O
</s>
<s>
It	O
is	O
an	O
optical	O
touchscreen	B-Device
supporting	O
two-point	O
multi-touch	B-Application
via	O
three	O
cameras	O
,	O
unlike	O
other	O
tablets	B-Device
which	O
use	O
a	O
capacitive	O
touchscreen	B-Device
.	O
</s>
<s>
The	O
keyboard	O
includes	O
shortcut	O
keys	O
for	O
access	O
to	O
Android	B-Application
menus	O
such	O
as	O
the	O
home	O
screen	O
and	O
music	O
controls	O
,	O
replacing	O
the	O
usual	O
function	B-Application
keys	I-Application
and	O
Start/Escape	O
keys	O
.	O
</s>
<s>
The	O
Slate	O
21	O
runs	O
Android	B-Application
4.2.2	I-Application
Jelly	I-Application
Bean	I-Application
.	O
</s>
<s>
Software	O
bundled	O
with	O
the	O
device	O
include	O
Google	B-Application
Chrome	I-Application
,	O
HP	O
's	O
own	O
media	O
playback	O
app	O
,	O
and	O
the	O
mobile	O
version	O
of	O
Kingsoft	B-Application
Office	I-Application
.	O
</s>
<s>
Cherlynn	O
Low	O
of	O
Tom	O
's	O
Guide	O
gave	O
a	O
mixed	O
review	O
,	O
saying	O
that	O
the	O
Slate	O
21	O
was	O
an	O
inexpensive	O
all-in-one	B-Device
for	O
users	O
who	O
do	O
not	O
require	O
a	O
powerful	O
computer	O
.	O
</s>
<s>
Dave	O
Oliver	O
of	O
Wired	O
UK	O
gave	O
a	O
score	O
of	O
7/10	O
,	O
concluding	O
that	O
while	O
the	O
Slate	O
21	O
could	O
be	O
"	O
the	O
logical	O
next	O
step	O
"	O
in	O
theory	O
,	O
the	O
lack	O
of	O
apps	O
optimized	O
for	O
the	O
large	O
screen	O
meant	O
that	O
the	O
device	O
was	O
"	O
not	O
quite	O
ready	O
"	O
to	O
replace	O
Windows	B-Application
computers	I-Application
.	O
</s>
<s>
The	O
HP	B-Application
Slate	I-Application
21	I-Application
Pro	O
was	O
announced	O
during	O
CES	O
2014	O
.	O
</s>
<s>
It	O
includes	O
16	O
GB	O
of	O
onboard	O
storage	O
and	O
2	O
GB	O
of	O
RAM	B-Architecture
,	O
twice	O
that	O
of	O
the	O
Slate	O
21	O
.	O
</s>
<s>
Because	O
it	O
includes	O
an	O
HDMI	B-Protocol
input	O
and	O
an	O
upstream	O
USB	O
port	O
,	O
it	O
can	O
be	O
used	O
as	O
a	O
touchscreen	B-Device
display	O
when	O
plugged	O
into	O
a	O
conventional	O
Windows	B-Application
computer	O
.	O
</s>
<s>
The	O
device	O
is	O
preinstalled	O
with	O
Citrix	B-Application
Receiver	I-Application
.	O
</s>
