Features: case / bezel material: resin stainless steel bracelet mineral crystal digital display 10 years battery led backlight afterglow telememo dual time 1/100-second stopwatch countdown timer multi-function alarms hourly time signal auto-calendar (to year 2039) am/pm display 12/24-hour format regular timekeeping accuracy: ±30 seconds per month solid case back deployment clasp 30m water resistance approximate size of case 43.1 x 37.7 x 10.4mm