Casio Men's Watches BG-6901-7ER Shock Resistant, 200M Water Resistant, EL Backlight with Afterglow, Flash Alert World Time, 2 Multi-function Alarms and 1 Snooze Alarm, Hourly Time Signal 1/100 second stopwatch, Countdown Timer, Full Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats, Button Operation Tone on/off, Accuracy: +/- 30 seconds per month Battery: CR2016, Approx. battery life: 5 years, Module 3297, size of case/total weight: 49.1 x 45.0 x 13.5mm / 47.0g