Nixon Men's A3851689-00 Rhythm Digital Display Japanese Quartz Grey Watch Imported 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