The B640WD-1A men's watch is part of Casio's retro collection and is jam-packed with functions. This iconic design features a 39mm stainless steel case and bracelet. Specifications:1/100-second stopwatch50-meter water resistancePopular retro designLED BacklightCase / bezel material: ResinAdjustable ClaspStainless Steel BandResin Glass50-meter water resistanceLED Backligh: AfterglowFlash alert: Flashes with buzzer that sounds for alarms, hourly time signal1/100-second stopwatchMeasuring 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 timesCountdown timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)Other: Auto-repeatMulti-function alarmHourly time signalFull auto-calendar (to year 2039)12/24-hour formatRegular timekeeping: Hour, minute, second, pm, month, date, dayAccuracy: ±30 seconds per monthApprox. battery life: 3 years on CR2016Size of case : 38.9×35×9.4mmTotal weight : 49g Warranty: 2 Year International Manufacturer's Warranty