B640WB-1A

Basic Information

• Case size (L× W× H)

  38.9 × 35 × 9.4 mm

• Weight

  49 g

• Case and bezel material

  Case / bezel material: Resin

• Band

  Adjustable ClaspStainless Steel Band

• Water resistance

  50-meter water resistance

• Power supply and battery life

  Approx. battery life: 3 years on CR2016

Exterior

• Glass

  Resin Glass

• Surface treatment

  Black ion plated bandBlack IP

Watch Features

• 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 signalMulti-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 formatRegular timekeeping: Hour, minute, second, pm, month, date, day