Nope it is on the device...
I stand corrected it is on both....
Actually my SP4 pen will in fact stick to the side of my metal desktop case. It is either a magnet or has been magnetized.
I'll be darned there magnets and both the pen and the device... just tested it... I can attach the mold pen to themSP4 using the metal pen clip, and the SP4 Pen does stick to metal.... very cool