G-Shock Men's Watch G-Shock G-7800B-1DR - WW Shock Resistant, 200 Meter Water Resistant, Auto EL Backlight with Afterglow, Flash Alert Flasher with buzzer that sounds for alarms, hourly time signal, countdown timer time-up alarm, LED flashes to indicate mode change when button tone operation is turned off, World Time 31 time zones (31 cities + Universal Coordinated Time), city code display, daylight savings on/off 1/100 Second Stopwatch, Countdown Timer, Selectable Timer modes: One-time, countdown/count up, auto repeat, Other: Preset Timer (preset start times 1, 3, 5, 10, 15, 30, 45, 60 minutes) 4 Multi-function Alarms and 1 Snooze Alarm (Daily, Once, Weekend, Weekday),Hourly Time Signal (Daily, Once, Weekend, Weekday, selectable window 1-hour increments), Auto Calendar (pre-programmed until the year 2099), 12/24 Hour Formats, Button Tone Operation on/off ,Curent time display style (24 styles) Custom Memo: 14 characters x 2, Font Setting: bold or narrow, Screen Contrast Level: 7 levels, Accuracy: 15 seconds per month,Battery CR2025, Approx. battery life: 5 years, Module 3163, Size of case/total weight: 50.4 x 43.8 x 15.1mm / 66g