Casio Baby-G Square Digital , Case / bezel material: Resin , Resin Band , Compatible band size - 125 to 180 mm , Shock Resistant , 100-meter water resistance , Power supply and battery life - Approx. battery life: 2 years on CR1616 , Mineral Glass , Stopwatch - 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 . Timer - 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 . Hourly time signal , Multi-function alarm , Flash alert feature , Flash alert Flashes with buzzer that sounds for alarms, hourly time signals . Light - Electro-luminescent backlight Afterglow . Light color - LED White Calendar - Full auto-calendar (to year 2099) . Accuracy: ±15 seconds per month . 12/24-hour format , Regular timekeeping: Hour, minute, second, pm, month, date, day , Case size (L× W× H) 42.1 × 37.9 × 11.3 mm , Weight 30 g .