Shock Resistant Rust Resistant 200M Water Resistant Auto Dual EL Backlights with Afterglow Tide Graph Moon Data (moon age of the input data, moon graph) World Time 29 times zones (48 cities), city code display, daylight saving on/off 3 Multi-function Alarms (1 with snooze) Hourly Time Signal Flash Alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm, countdown timer progress beeper and stopwatch auto start 1/100 second stopwatch Measuring capacity: 23:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Other: 5-second auto-start Countdown Timer Measuring unit: 1 second Countdown range: 1 minute to 24 hours Others: Auto Repeat, timeup alarm, progress beeper Button Tone Operation On/Off Full Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Accuracy: ±15 seconds per month Battery: CR2025 Approx. battery life: 7 Years Module 3088 Size of case/total weight G9100 51.0 x 46.0 x 16.4mm / 53g