Shock Resistant, 200 Meter Water Resistant. Case diameter : 45 mm EL Backlight with Afterglow, Multi-function Alarm, 1/100 second stopwatch. TO set time and Date:1. Press A while in the Timekeeping Mode. The seconds digits flash on the display because they are selected 2. Press C to change the selection in the following sequence Countdown Timer, Auto-repeat function, Hourly Time Signal, Auto Calendar (pre-programmed until the year 2039) If you do not operate any button for a few minutes while a selection is flashing. the flashing stops and the watch goes back to the timekeeping mode automatically In an effort to avoid the navigation buttons being pushed accidentally they are purposely designed to be a bit harder to push in. This is not a defect or flaw.