All gshock at our store is original If fake money back guarantee Specifications Case / bezel material: Resin Resin Band Mineral Glass Shock Resistant 200-meter water resistance Electro-luminescent backlight Afterglow Flash alert Flashes with buzzer that sounds for alarms, hourly time signals 1/100-second stopwatch Measuring capacity: 00'00''00~59'59''99 (for the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes) Measuring unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) Other: Auto-repeat Multi-function alarm Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy: 15 seconds per month Approx. battery life: 2 years on CR2016 Close Size of case / Total weight Size of case : 53.25016.3mm Total weight : 67g