<s>
The	O
Fire	B-Application
HDX	I-Application
,	O
formerly	O
named	O
Kindle	B-Application
Fire	I-Application
HDX	I-Application
,	O
was	O
a	O
high-end	O
model	O
in	O
Amazon	B-Application
Fire	I-Application
line	O
of	O
tablet	B-Application
computers	I-Application
.	O
</s>
<s>
In	O
September	O
2014	O
,	O
Amazon	B-Application
released	O
the	O
second	O
generation	O
of	O
the	O
Fire	B-Application
HDX	I-Application
8.9	O
model	O
that	O
has	O
a	O
faster	O
processor	O
and	O
a	O
more	O
powerful	O
graphics	O
processing	O
unit	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
name	O
"	O
Kindle	O
"	O
was	O
removed	O
from	O
all	O
of	O
the	O
Fire	B-Application
tablets	I-Application
 '	O
names	O
.	O
</s>
<s>
The	O
Fire	B-Application
HDX	I-Application
tablets	B-Device
were	O
discontinued	O
,	O
and	O
the	O
Fire	B-Application
HD	I-Application
tablet	B-Device
line	O
now	O
includes	O
the	O
most	O
powerful	O
versions	O
of	O
Amazon	B-Application
Fire	I-Application
devices	O
.	O
</s>
<s>
Both	O
the	O
7inch	O
and	O
8.9inch	O
LCD	B-Device
models	O
contain	O
a	O
Qualcomm	B-Architecture
Snapdragon	I-Architecture
800	O
processor	O
that	O
has	O
an	O
Adreno	B-General_Concept
330	O
GPU	O
.	O
</s>
<s>
The	O
Fire	B-Application
HDX	I-Application
features	O
Dolby	O
Digital	O
Plus	O
audio	O
engine	O
powering	O
the	O
two	O
attached	O
speakers	O
.	O
</s>
<s>
The	O
Fire	B-Application
HDX	I-Application
8.9	O
"	O
refresh	O
in	O
2014	O
uses	O
a	O
Qualcomm	B-Architecture
Snapdragon	I-Architecture
805	O
processor	O
with	O
an	O
Adreno	B-General_Concept
420	O
GPU	O
.	O
</s>
<s>
Both	O
models	O
use	O
Fire	B-Application
OS	I-Application
3	O
which	O
is	O
a	O
proprietary	B-Application
fork	B-Application
of	O
Android	B-Application
4.2.2	O
.	O
</s>
<s>
It	O
features	O
"	O
Mayday	O
"	O
,	O
a	O
button	O
for	O
free	O
tech	O
support	O
available	O
any	O
time	O
,	O
"	O
Silk	B-Protocol
"	O
,	O
a	O
cloud-accelerated	O
browser	O
,	O
the	O
Amazon	B-Application
Appstore	O
for	O
games	O
and	O
apps	O
and	O
Amazon.com	B-Application
services	O
for	O
media	O
content	O
purchases	O
.	O
</s>
<s>
The	O
tablets	B-Device
can	O
send	O
video	O
content	O
to	O
a	O
supported	O
TV	O
,	O
game	O
console	O
or	O
through	O
a	O
device	O
like	O
a	O
Wireless	O
Display	O
HDMI	O
adapter	O
wirelessly	O
using	O
"	O
Second	O
Screen	O
"	O
,	O
but	O
cannot	O
send	O
content	O
via	O
a	O
HDMI	O
cable	O
like	O
its	O
predecessor	O
,	O
the	O
Kindle	B-Application
Fire	I-Application
HD	I-Application
.	O
</s>
<s>
The	O
2014	O
refresh	O
uses	O
Fire	B-Application
OS	I-Application
4	O
"	O
Sangria	O
"	O
,	O
which	O
features	O
profiles	O
so	O
each	O
user	O
on	O
the	O
tablet	B-Device
can	O
have	O
their	O
own	O
settings	O
and	O
apps	O
.	O
</s>
<s>
Sascha	O
Segan	O
of	O
PC	O
Magazine	O
mentioned	O
:	O
"	O
Press	O
the	O
Mayday	O
button	O
,	O
and	O
within	O
15	O
seconds	O
,	O
a	O
live	O
Amazon	B-Application
operator	O
appears	O
in	O
a	O
video	O
chat	O
window	O
on	O
your	O
screen	O
to	O
answer	O
all	O
of	O
your	O
Kindle	B-Application
Fire	I-Application
questions	O
.	O
</s>
<s>
I	O
've	O
never	O
seen	O
anything	O
else	O
like	O
it	O
on	O
a	O
tablet.	O
"	O
</s>
<s>
In	O
his	O
review	O
of	O
the	O
Kindle	B-Application
Fire	I-Application
HDX	I-Application
7	O
"	O
he	O
called	O
the	O
Mayday	O
remote	O
video	O
support	O
feature	O
as	O
"	O
revolutionary	O
"	O
and	O
"	O
Amazon	B-Application
's	O
most	O
exciting	O
feature	O
"	O
.	O
</s>
<s>
In	O
June	O
2018	O
,	O
however	O
,	O
Amazon	B-Application
"	O
quietly	O
"	O
discontinued	O
the	O
Mayday	O
feature	O
.	O
</s>
<s>
The	O
Fire	B-Application
HDX	I-Application
's	O
UI	O
has	O
a	O
"	O
Carousel	O
"	O
which	O
contains	O
the	O
most	O
recent	O
apps	O
used	O
and	O
ones	O
that	O
have	O
been	O
updated	O
or	O
purchased	O
recently	O
.	O
</s>
<s>
The	O
Fire	B-Application
HDX	I-Application
also	O
has	O
a	O
favorites	O
tab	O
in	O
which	O
the	O
user	O
can	O
access	O
the	O
users	O
apps	O
from	O
any	O
other	O
application	O
.	O
</s>
<s>
Overview	O
on	O
generations	O
and	O
models	O
for	O
all	O
Fire	B-Application
tablet	I-Application
devices	O
:	O
</s>
<s>
Detailed	O
specifications	O
for	O
all	O
Fire	B-Application
HDX	I-Application
tagged	O
tablet	B-Device
devices	I-Device
:	O
</s>
<s>
The	O
Model	O
number	O
consists	O
of	O
three	O
parts	O
:	O
first	O
the	O
KF	O
prefix	O
for	O
'	O
Kindle	B-Application
Fire	I-Application
 '	O
,	O
second	O
one	O
or	O
two	O
letters	O
derived	O
from	O
the	O
code	O
name	O
,	O
third	O
WI	O
for	O
Wi-Fi	O
or	O
WA	O
for	O
cellular	O
interface	O
.	O
</s>
<s>
Engadget	B-Application
gave	O
the	O
Fire	B-Application
HDX	I-Application
an	O
85	O
out	O
of	O
100	O
,	O
saying	O
that	O
it	O
may	O
be	O
the	O
most	O
compelling	O
case	O
for	O
Amazon	B-Application
's	O
tablet	B-Device
ecosystem	B-Application
.	O
</s>
<s>
While	O
advanced	O
users	O
may	O
be	O
turned	O
off	O
by	O
the	O
limited	O
app	O
selection	O
,	O
the	O
display	O
's	O
gorgeous	O
color	O
accuracy	O
may	O
make	O
the	O
tablet	B-Device
a	O
good	O
buy	O
for	O
everyone	O
else	O
,	O
especially	O
Amazon	B-Application
Prime	O
members	O
.	O
</s>
<s>
PC	O
Magazine	O
gave	O
the	O
Amazon	B-Application
Kindle	I-Application
Fire	I-Application
HDX	O
7	O
"	O
(	O
Wi-Fi	O
)	O
edition	O
4	O
out	O
of	O
5	O
and	O
rated	O
"	O
Excellent	O
"	O
while	O
following	O
pros	O
were	O
noted	O
:	O
"	O
Sharp	O
screen	O
.	O
</s>
<s>
The	O
Fire	B-Application
HDX	I-Application
's	O
screen	O
has	O
high	O
color	O
accuracy	O
and	O
high	O
pixel	B-Algorithm
density	I-Algorithm
at	O
339PPI	O
,	O
and	O
as	O
of	O
early	O
2013	O
was	O
one	O
of	O
the	O
highest	O
of	O
tablet	B-Device
devices	I-Device
commercially	O
available	O
.	O
</s>
<s>
However	O
,	O
CNET	O
pointed	O
out	O
that	O
no	O
Google	B-Application
Play	I-Application
access	O
means	O
limited	O
app	O
selection	O
compared	O
to	O
other	O
Android	B-Application
tablets	B-Device
and	O
some	O
users	O
may	O
be	O
bothered	O
by	O
an	O
additional	O
$15	O
to	O
remove	O
ads	O
on	O
the	O
lock	O
screen	O
,	O
while	O
ads	O
on	O
the	O
home	O
screen	O
can	O
be	O
removed	O
with	O
a	O
system	O
setting	O
.	O
</s>
