"Tough Solar Power Shock Resistant 200M Water Resistant Auto EL Backlight with Afterglow 30 Page Databank Memory capacity: Up to 30 sets of data, each set including; Name (8 characters) and telephone number (14 digits) Auto-sort function World Time: 29 time zones (27 cities), city code display, daylight saving on/off 5 Multi-function Alarms Countdown Timer Measuring unit: 1/10 second Countdown range: 1 second 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 Auto-start function Hourly Time Signal Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy: ±15 seconds per month Storage Battery ML2016 Battery Power Indicator Power Saving Function Approx. battery life: 6 months on full charge (without further exposure to light) Module 2184 Size of case/total weight: 52.5 x 46.4 x 15.6mm / 65g"