Features: Resin Case Resin Strap Quartz Movement Resin Crystal Digital Display Dual Time 1/100 Second Stopwatch Countdown Timer Hourly Time Signal 5 Multi Function Alarms LED Backlight Afterglow Full Auto Calendar Regular Timekeeping 12/24 Hours Display Day And Date Display Screwed Case Back Buckle Clasp 100m Water Resistance Approximate Case Diameter: 51.2mm Approximate Case Thickness: 15.7mm