Accuracy
±30 seconds per month
Alarm hourly time signal
Hourly time signal | Multi-function alarm
App connectivity feature
https://www.casio.com/mea-en/watches/casio/product.B640WD-1AV/
Band
Stainless Steel Band | Adjustable Clasp
Calendar
Full auto-calendar (to year 2039)
Case and bezel material
Resin
Case size l w h
38.9 × 35 × 9.4 mm
Compatible band size
150 to 205 mm
Light
LED backlight | Afterglow
Other features
Flash alert | 12/24-hour format | Hour, minute, second, pm, month, date, day
Power supply and battery life
3 years
Stopwatch
1/100-second stopwatch; multi-range capacity; elapsed/split/1st-2nd place
Timer
Countdown timer; 24 hours; 1 second | Auto-repeat
Water resistance
50-meter water resistance
