<s>
The	O
Twiddler	B-Device
is	O
a	O
chorded	B-Device
keyboard	I-Device
allowing	O
one	O
to	O
type	O
with	O
a	O
single	O
hand	O
.	O
</s>
<s>
The	O
first	O
Twiddler	B-Device
device	O
was	O
launched	O
in	O
1992	O
by	O
the	O
HandyKey	O
Corporation	O
.	O
</s>
<s>
The	O
original	O
Twiddler	B-Device
uses	O
a	O
serial	B-Protocol
port	I-Protocol
for	O
communication	O
and	O
a	O
PC	B-Operating_System
AT	I-Operating_System
keyboard	O
port	O
for	O
power	O
.	O
</s>
<s>
This	O
was	O
replaced	O
with	O
USB	B-Protocol
for	O
the	O
Twiddler	B-Device
2	O
.	O
</s>
<s>
The	O
third	O
generation	O
Twiddler	B-Device
communicates	O
using	O
USB	B-Protocol
or	O
Bluetooth	B-Protocol
through	O
an	O
optionally	O
installed	O
module	O
.	O
</s>
