Features: case/bezel material: resin resin strap resin/spherical crystal digital display led light illuminator afterglow multi time (4 different cities) world map 10 year battery world time 31 time zones (48 cities + utc) 1/100-second stopwatch countdown timer 5 daily alarms or one-time alarms hourly time signal full auto-calendar (to year 2099) 12/24-hour format button operation tone on/off regular timekeeping accuracy: ±30 seconds per month day display buckle clasp 100m water resistance approximate size of case: 48.1 x 43.7 x 13.7mm