Straight from the Casio Vintage Collection comes a timepiece that never goes out of style. The B640 combines style with features Casio is known for such as an EL backlight and a 1/100th second stopwatch. This timepiece is the perfect complement to any outfit..

Features:
1/100-second stopwatch
50-meter water resistance
Popular retro design
LED Backlight
Black ion plated band

Specifications:
Case / bezel material: Resin
Stainless Steel Band
Adjustable Clasp
Resin Glass
Black ion plated band
Black IP
50-meter water resistance
LED Backlight
Afterglow
Flash alert
Flashes with buzzer that sounds for alarms, hourly time signal
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
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
Multi-function alarm
Hourly time signal
Full auto-calendar (to year 2039)
12/24-hour format
Regular timekeeping: Hour, minute, second, pm, month, date, day
Accuracy: ±30 seconds per month
Approx. battery life: 3 years on CR2016

Size of case / Total weight:
Size of case: 38.9×35×9.4mm
Total weight: 49g