Features: Resin Case Resin Strap Quartz Movement Resin Crystal Black Dial Digital Display Dual Time 1/100 Second Stopwatch Daily Alarm Hourly Time Signal LED Backlight Afterglow Full Auto Calendar Regular Timekeeping 12/24 Hours Display Day And Date Display Screwed Case Back Buckle Clasp 50m Water Resistance Approximate Case Diameter: 40.4mm Approximate Case Thickness: 10mm