This was a notebook PC with a thickness of 35mm and weight of 2.2kg. It achieved complete compatibility with NEC's "PC-9800 Series" by using a CPU equivalent to the µPD70116 (clock frequency 10MHz). It exploited a number of innovative technologies which Seiko-Epson had been developing for many years, including high-density mounting technology, liquid crystal technology, CMOS-LSI technology and energy conservation technology. By using two revolutionary technologies -- a thin reflective FTN (Film Compensated STN) liquid crystal display body, and an ultra-thin video circuit module -- Seiko-Epson was able to realize the world's thinnest personal computer. It was announced in June 1989.