DGTL BST.47 Boost Shock Watch - BlackFeatures:Adjustable black 20mm silicone quick-release strap fits up to 8-inch wrist circumferenceShock resistant to I.S.O. standards; chronograph with 50-lap memory; 3 customizable alarm; countdown & interval timerTwo time zones; 24-hour military time mode; day, date & month calendarBlack 47mm resin square case; mineral glass lens; negative digital display; Indiglo light-up watch dialWater resistant to 200m (660 ft): In general, suitable for professional marine activity and serious surface water sports, but not scuba diving