This document presents a seminar presentation on 5 Pen PC technology. It discusses the history and introduction of the 5 Pen PC, which was created in 2003 by NEC as a pen-style personal networking device. It then describes the 5 main functions of the 5 Pen PC: the CPU pen, camera pen, virtual keyboard, projector pen, and communication pen. It provides details on the electronic perception technology used and covers the merits and demerits of the 5 Pen PC. In conclusion, it discusses how communication devices are becoming more compact and this represents the start of new technologies.