Case size (L× W× H)

38.9 × 35 × 9.4 mm

Weight

49 g

Case and bezel material

Resin

Band

Adjustable Clasp

Stainless Steel Band

Water resistance

50-meter water resistance

Power supply and battery life

Approx. battery life: 3 years on CR2016

Glass

Resin Glass

Surface treatment

Black ion plated band

Black IP

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

Alarm/hourly time signal

Hourly time signal

Multi-function alarm

Flash alert feature

Flash alert Flashes with buzzer that sounds for alarms, hourly time signal

Light

LED backlight Afterglow

Light color

LED:Amber

Calendar

Full auto-calendar (to year 2039)

Accuracy

Accuracy: ±30 seconds per month

Other features

12/24-hour format

Regular timekeeping: Hour, minute, second, pm, month, date, day

Basic Information

Casio Retro Unisex WR - B640WB-1ADF

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