<s>
A	O
BAT	B-Device
keyboard	I-Device
is	O
a	O
one-handed	O
chording	B-Device
keyboard	I-Device
consisting	O
of	O
a	O
base	O
,	O
on	O
which	O
the	O
hand	O
rests	O
,	O
and	O
seven	O
keys	O
.	O
</s>
<s>
Through	O
pressing	O
combinations	O
of	O
keys	O
,	O
one	O
can	O
attain	O
the	O
same	O
functions	O
as	O
a	O
regular	O
keyboard	B-Device
.	O
</s>
<s>
The	O
keyboard	B-Device
can	O
be	O
useful	O
for	O
those	O
with	O
a	O
disability	O
and	O
also	O
as	O
a	O
complement	O
to	O
the	O
mouse	O
,	O
on	O
which	O
the	O
other	O
hand	O
can	O
remain	O
.	O
</s>
<s>
The	O
BAT	B-Device
keyboard	I-Device
exists	O
in	O
left-handed	O
and	O
right-handed	O
versions	O
,	O
which	O
can	O
also	O
be	O
used	O
simultaneously	O
with	O
each	O
other	O
or	O
even	O
with	O
another	O
alphanumeric	B-Device
keyboard	I-Device
if	O
desired	O
.	O
</s>
