G-Shock is dedicated to the ongoing pursuit of further advancement of the Classic G-Shock watch considering every possible option to improve upon the product. G-Shock Classic Watches are a reflection of this pursuit in its purest sense.Shock ResistantAlarm ChronographMineral CrystalIlluminator BacklightShock resistant (G-Shock)Electro-luminescent backlight1/100 second stopwatchMeasuring capacity: 23 hours 59 minutesMeasuring mode: net time - split time - 1st-2nd place timesCountdown alarm input range: 1 minute to 24 hoursMeasuring unit: 1 secondAuto-repeat functionDaily alarmHourly time signalRegular timekeeping: hour - minute - second - am/pm - month - date - dayAuto-calendar (pre-programmed until the year 2039)12/24-hour formatsAccuracy: 15 seconds per monthBattery: Approx. 2 years on CR2016