PaperShow Digital Pen Includes Set of 3 ink Cartridges, 4 color Rings and Battery The PaperShow Bluetooth Digital Pen is designed to work only with the software, the PaperShow Bluetooth USB key and the PaperShow interactive paper. The micro-camera embedded in the pen determines the position of the pen tip on the page of the interactive paper 75 times per second and transmits it instantaneously to the PaperShow application by the cordless Bluetooth link.