Features: resin case resin strap quartz movement mineral crystal analog digital display digital compass double led light low temperature resistant mobile link altimeter barometer thermometer world time stopwatch countdown timer 5 daily alarms hourly time signal full automatic calendar luminous hands day and date display 12/24 hours display am/pm display accuracy: ±15 seconds per month screwed case back buckle clasp 100m water resistance approximate case diameter: 51mm approximate case thickness: 16mm