REACTOR Men's 'Gamma TI' Quartz Titanium Watch, Color:Silver-Toned (Model: 52501) Secure screw bar case to band interface for superior strength Never dark Tritium and Superluminova Japanese-quartz Movement Case Diameter: 45.5mm Water Resistant 300m (990ft):in General, Suitable for Professional Marine Activity and Serious Surface Water Sports, but not Diving