As discussed above, there were new conquests in the advancement of the handheld calculator following the fall of LED models. The leader in sales and manufacturing was TI, and they symbolically contributing to the Casio-dominated clock/calculator field with this entry. The DataChron may be considered an early electronic organizer as it packed as much technology available into this shirt pocket-sized unit. Full compliment of time, alarm and stopwatch functions behind an early UV-filtered LCD display. Sold for about $40 is 1977.