Rubber band with buckle closure. Shock resistant. EL backlight with Afterglow. Multifunction alarm. Automatic calendar has been pre-programmed until 2039. 1/100 second stopwatch with measuring capacity of 59’59’99. Countdown timer with 1 second measuring unit and 24 hours range (1-second increments and 1-hour increments); auto-repeat function. Module: 1545 Battery: CR2016 Water resistant to 200 meters. Dimensions: Face Width 29mm Face Height 25mm Face Depth 12mm Band Width 21mm Band Circumference 8.5 inches