B640 Series

B640WB-1B

• 1/100-second stopwatch • 5 bar water resistance • Popular retro design • LED Backlight • Black ion plated band

Specifications

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-metre water resistance
Power supply and battery life

Approx. battery life: 3 years on CR2016

Stopwatch

1/100-second stopwatch Measuring capacity: 00'00''00 to 59'59''99 (for the first 60 minutes) 1:00'00 to 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 colour

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

*The colour tone of the listed products may differ from the actual product in some cases.

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