Casio Digital Diary SF-4000

This Casio SF-4000 digital diary is an early form of personal data storage device featuring: telephone directory, memo, calendar, schedule and calculator functions. It has 32K of memory which equaled 31902 characters. It has a 6-line LCD screen which could display any full month from 1901 - 2099. It is powered by 3 lithium batteries CR2025. Comes with original operation manual (English & Spanish). Made in Japan.