Casio G9000-8V G-Shock MudMan Mud Resistance Watch Shock Resistant, Mud Resistant (Case &amp; buttons are sealed to prevent mud, dirt and dust from getting into the watch) Auto Dual EL Backlights with Afterglow, Low Temperature Resistant (-20 Degrees C), World Time 4 Daily Alarms &amp; 1 Snooze Alarm, Countdown Timer, 1/100 Second Stopwatch (ST1) 1/100 Second Stopwatch (ST2), Hourly Time Signal, Auto Calendar (Pre-programmed until the year 2099) 12/24 Hour Formats, Accuracy: +/-15 seconds per month,Battery CR2025Approx. battery life: 3 years ,