E-Data Memory. Memory capacity: 50 entries, up to 63. characters per entry. Password protected. Auto-sort function. 300 Page Databank. 8 letters and 12 numerals per page. Auto-sort function. 8-Digit Calculator. Constants for addition, subtraction, multiplication and division. Auto EL Backlight with Afterglow. World Time. 26 time zones (100 cities), city code display, daylight saving on/off. 4 Multi-function Alarms & 1 Multi-function Snooze Alarm. Countdown Timer. Measuring unit: 1/10 second. Countdown range: 1 minute to 24 hours. Auto-repeat Function. 1/100 second stopwatch. Measuring capacity: 23:59’59.99”. Measuring modes: Elapsed time, split time, 1st-2nd place times. Hourly Time Signal. Auto Calendar (pre-programmed until the year 2039). 12/24 Hour Formats. Battery Power Indicator. Accuracy: +/-15 seconds per month. Battery CR2016. Approx. battery life: 2 years. Module 2550.