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 (100 hr)
• LED Backlight
• 50M Water Resistant
• Measuring capacity: 59'59.99"
• Measuring modes: Elapsed time, split time, 1st-2nd place times
• Daily alarm
• Hourly time signal
• Auto-calendar (auto-calendar set at 28 days for February)
• 12/24-hour format
• Regular timekeeping
• Hour, minute, second, pm, date, day
• Accuracy: ±30 seconds per month
• Approx. battery life: 7 years on CR2016
• Module: 3454
• Size of case / total weight:  43.1 x 41.2 x 10.5 mm / 63 g

• Allowances are made automatically for months of different lengths, including leap year.
• Simultaneous display of the current time in two different time zones.
• The daily alarm sounds each day at the time you set. The value indicates how many daily alarms are available. The hourly time signal causes the watch to beep every hour on the hour.
• Accurate measurement of elapsed time with the touch of a button. The fraction indicates the unit of measurement, while the time figure indicates the maximum time measurement.
• Resin Band
• Water-resistant under normal, everyday use.

The iconic square case you know and love in the original DW-5600 yellow, green, and blue, colors launched outside of Japan back in the late '80s and early 90's plus new colour versions now released too.