B640WDG-7D

Battery Life / Accuracy
Approximately 3 years (+/-30 seconds per month)

Crystal
Resin glass

Light
LED backlight (afterglow)

Case & Band Material
Resin case with metal band (slide clasp)

Water Resistance
50m

Case Size
Thickness: 9.9 mm
Diameter: 35.0 mm
Length: 38.9 mm

Other Specifications
1/100-second stopwatch
Countdown timer (auto-repeat)
Hourly time signal
Multi-function alarm
Flash alert (flashes with buzzer that sounds)
Full auto-calendar (to year 2039)
12/24-hour format
Regular timekeeping (digital display)