[Adjustable black 16mm resin strap fits up to 8-inch wrist circumference 100-hour chronograph; 24-hour countdown timer; 3 vibrating & audible daily weekday or weekend alarms; shock resistant to I.S.O. standards 24-hour military time mode; 3 time zones; occasion reminders; hydration timer; month day & date calendar Black 50mm resin case with acrylic lens; gray digital display; Indiglo light-up watch dial. Strap and lug width is 16 mm Water-resistant to 100m (330 ft): In general suitable for snorkeling as well as swimming but not diving Designed For Outdoor Torture Tests Shock Resistant to I.S.O. Standards Quartz Movement Case Diameter: 50mm Water Resistant To 330 Feet]