<s>
A	O
laptop/notebook	O
cooler	O
,	O
cooling	B-Device
pad	I-Device
,	O
cooler	B-Device
pad	I-Device
or	O
chill	B-Device
mat	I-Device
is	O
an	O
accessory	O
for	O
laptop	B-Device
computers	I-Device
intended	O
to	O
reduce	O
their	O
operating	O
temperature	O
when	O
the	O
laptop	B-Device
is	O
unable	O
to	O
sufficiently	O
cool	O
itself	O
.	O
</s>
<s>
Laptop	B-Device
coolers	I-Device
are	O
intended	O
to	O
protect	O
both	O
the	O
laptop	B-Device
from	O
overheating	O
and	O
the	O
user	O
from	O
suffering	O
heat	O
related	O
discomfort	O
.	O
</s>
<s>
A	O
cooling	B-Device
pad	I-Device
may	O
house	O
active	O
or	O
passive	O
cooling	O
methods	O
and	O
rests	O
beneath	O
the	O
laptop	B-Device
.	O
</s>
<s>
Active	O
coolers	O
move	O
air	O
or	O
liquid	O
to	O
direct	O
heat	O
away	O
from	O
the	O
laptop	B-Device
quickly	O
,	O
while	O
passive	O
methods	O
may	O
rely	O
on	O
thermally	O
conductive	O
materials	O
or	O
increasing	O
passive	O
airflow	O
.	O
</s>
<s>
Active	O
coolers	O
use	O
small	O
fans	B-Application
to	O
generate	O
additional	O
airflow	O
around	O
the	O
body	O
of	O
the	O
laptop	B-Device
.	O
</s>
<s>
The	O
number	O
of	O
laptop	B-Device
cooler	I-Device
fans	B-Application
usually	O
ranges	O
from	O
1	O
to	O
6	O
.	O
</s>
<s>
Coolers	O
typically	O
run	O
on	O
power	O
drawn	O
through	O
one	O
of	O
the	O
laptop	B-Device
's	O
USB	B-Protocol
ports	I-Protocol
.	O
</s>
<s>
Additionally	O
,	O
many	O
cooler	B-Device
pads	I-Device
come	O
with	O
a	O
built-in	O
USB	B-Protocol
hub	O
,	O
so	O
as	O
not	O
to	O
consume	O
one	O
of	O
the	O
laptop	B-Device
's	O
often	O
limited	O
number	O
of	O
USB	B-Protocol
ports	I-Protocol
.	O
</s>
<s>
Poorly	O
designed	O
coolers	O
may	O
use	O
fans	B-Application
which	O
draw	O
more	O
current	O
than	O
allowed	O
by	O
the	O
USB	B-Protocol
standard	O
.	O
</s>
<s>
Without	O
correct	O
protection	O
,	O
such	O
devices	O
can	O
cause	O
damage	O
to	O
the	O
USB	B-Protocol
power	O
supply	O
.	O
</s>
<s>
Inside	O
the	O
laptop	B-Device
,	O
the	O
USB	B-Protocol
power-supply	O
has	O
to	O
output	O
an	O
additional	O
amount	O
of	O
watts	O
for	O
the	O
USB-powered	O
fan	O
,	O
thus	O
generating	O
a	O
small	O
amount	O
of	O
additional	O
heat	O
.	O
</s>
<s>
This	O
additional	O
heat	O
generation	O
is	O
usually	O
insignificant	O
in	O
relation	O
to	O
the	O
amount	O
of	O
heat	O
a	O
fan	O
moves	O
away	O
from	O
the	O
laptop	B-Device
.	O
</s>
<s>
Some	O
high-end	O
active	O
coolers	O
have	O
blowers	O
instead	O
of	O
fans	B-Application
,	O
with	O
filters	O
to	O
stop	O
dust	O
from	O
entering	O
the	O
laptop	B-Device
,	O
and	O
have	O
seals	O
between	O
the	O
cooler	O
and	O
laptop	B-Device
surfaces	O
to	O
prevent	O
recirculation	O
of	O
hot	O
air	O
from	O
entering	O
the	O
laptop	B-Device
.	O
</s>
<s>
Typically	O
,	O
a	O
conductive	O
cooling	B-Device
pad	I-Device
allows	O
for	O
the	O
cooling	O
of	O
a	O
laptop	B-Device
without	O
using	O
any	O
power	O
.	O
</s>
<s>
These	O
"	O
pads	O
"	O
are	O
normally	O
filled	O
with	O
an	O
organic	O
salt	O
compound	O
that	O
allows	O
them	O
to	O
absorb	O
the	O
heat	O
from	O
the	O
laptop	B-Device
.	O
</s>
<s>
Other	O
designs	O
are	O
simply	O
a	O
pad	O
that	O
elevates	O
the	O
laptop	B-Device
so	O
that	O
the	O
fans	B-Application
in	O
the	O
laptop	B-Device
are	O
allowed	O
greater	O
airflow	O
.	O
</s>
<s>
Conductive	O
cooling	B-Device
pads	I-Device
are	O
not	O
advisable	O
for	O
laptops	B-Device
that	O
have	O
fan	O
vents	O
built	O
into	O
the	O
underside	O
;	O
the	O
cooling	B-Device
pad	I-Device
blocks	O
the	O
vents	O
,	O
leading	O
to	O
overheating	O
or	O
premature	O
system	O
failure	O
.	O
</s>
<s>
The	O
best	O
way	O
to	O
determine	O
if	O
a	O
cooling	B-Device
pad	I-Device
would	O
be	O
suitable	O
for	O
a	O
particular	O
laptop	B-Device
would	O
be	O
to	O
look	O
for	O
air	O
vents	O
or	O
fan	O
vents	O
on	O
the	O
laptop	B-Device
.	O
</s>
<s>
If	O
they	O
are	O
on	O
the	O
side	O
and	O
not	O
on	O
the	O
bottom	O
,	O
it	O
is	O
usually	O
safe	O
to	O
use	O
the	O
cooler	B-Device
pad	I-Device
;	O
otherwise	O
,	O
it	O
may	O
not	O
be	O
safe	O
to	O
use	O
a	O
conductive	O
cooler	B-Device
pad	I-Device
.	O
</s>
<s>
It	O
allows	O
airflow	O
both	O
between	O
the	O
laptop	B-Device
base	O
and	O
cooler	O
,	O
and	O
between	O
the	O
base	O
of	O
the	O
cooler	O
and	O
the	O
user	O
's	O
lap	O
.	O
</s>
<s>
These	O
laptop	B-Device
coolers	I-Device
are	O
suitable	O
for	O
laptops	B-Device
that	O
have	O
vents	O
on	O
the	O
underside	O
.	O
</s>
<s>
Some	O
laptop	B-Device
coolers	I-Device
also	O
feature	O
lights	O
that	O
are	O
activated	O
along	O
with	O
the	O
operation	O
of	O
the	O
cooling	O
fans	B-Application
.	O
</s>
<s>
Features	O
can	O
include	O
card	O
readers	O
for	O
various	O
forms	O
of	O
media	O
such	O
as	O
key	O
drives	O
,	O
memory	B-Device
cards	I-Device
,	O
and	O
2.5	O
"	O
laptop	B-Device
hard	B-Device
disk	I-Device
drives	I-Device
.	O
</s>
