It is called a pen. Humans use it for writing and conspiracy theories.
if its a pen how is it susoended on his arm ?
Humans keep pens up their sleeves. You can buy a wristband to hold the pen.
Its much more convenient than keeping a pen in your pocket or on the desk you would use it on.
I hope you're picking up my sarcasm.
Seriously? A pen?
Doh.