8ware Touch 8 Mobile Digital Pen Designed for Windows 8
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The attachment, which is really an infrared and ultrasonic receiver, clips magnetically to the side of the screen, which can be as large as 17 inches diagonally. The pen emits an infrared beam out of its tip. The receiver attachment sends the pen's signals to the computer, which interprets its precise location.
Pushing down on the pen results in a separate ultrasonic signal, which is equivalent to a touch screen sensing when you are touching it. Just like that, you can swipe and tap your way through Windows 8. The pen runs on a watch battery, which should last about 500 hours and is replaceable.