PaperShow USB Key Includes Set of 4 Color Rings The PaperShow Bluetooth USB key incorporating the PaperShow software is designed to work exclusively with the PaperShow Bluetooth digital pen and the PaperShow interactive paper. The PaperShow USB Key incorporates a Bluetooth module v2.0 + EDR and a Flash NAND MLC memory of 256 Mb with the PaperShow software embedded and the writing sessions recorded with the pen.