Casio Men's 'Heavy Duty Chronograph' Quartz Stainless Steel and Resin Casual Watch, Color:Black (Model: MCW-100H-9A2VCF) Heavy Duty Design, Chronograph, Resin Band, Stopwatch 3-Hand Analog, Date Display, Module:5434, 100M Water Resistant Quartz Movement Case Diameter: 49.3mm Water resistant to 100m (330ft): in general, suitable for swimming and snorkeling, but not diving