Not so much a combat item but a useful tool.
With the unique self stabilizing gyros included in the pen it can hold itself upright with out the need for a hand holding it. It is the ultimate lazy mans tool. It is able to take notes and verbal commands. In addition, one of its most prized abilities is that of near photo-like quality of the drawings it creates. Set it down and watch it draw the scene before it. With the proper command it can even break a mechanikal item down into a blueprint for the common schmoe.
Requires minimal power input and functions on micro-accumulators the size of an eraser.