Adjustable black 12mm resin strap fits up to 7.5-inch wrist circumferenceEasy-touch heart rate monitor; 7-day activity tracker measures calories, steps & distance; 100-hour chronograph with 10-lap memory24-hour countdown timer; customizable alarm; 24-hour military time mode; 2 time zones; day, date & month calendarBlack & silver-tone 33mm resin case; acrylic lens; gray digital display; Indiglo light-up watch dialWater-resistant to 100m (330 ft): In general, suitable for snorkeling, as well as swimming, but not diving