Nixon Men's 'Rhythm' Quartz Plastic and Polyurethane Watch, Color:Black (Model: A3851935-00) Compact 41 mm design with a large tide graph for those more concerned with the surf than punctuality Module shows 48 hour past/future tides and pre-programmed tide info for 270 beaches through 2023 Japanese-quartz Movement Case Diameter: 41mm Water Resistant To 100m (330ft): In General, Suitable for Swimming and Snorkeling, but not Diving