Caliber: Omega 1538 Quartz precision movement with rhodium-plated finish. End of battery life indicator Power reserve: 27 / 36 months Domed, scratch-resistant sapphire crystal with anti-reflective treatment inside Stainless steel case and bracelet Textured electric blue dial with large hour markers and hands. Unidirectional rotating bezel Screw-down crown and case back Case Size 36.25mm Thickness 11.4mm Rotating bezel showing a graduated scale, essential for calculating the diving times- in chrome. The particular shape of the bezel, rotating counter-clockwise, assures a safe hold even with the glove of the wet suit. Crown protected against shocks by the protrusions of the case. Water Resistant 300m (1000ft)! Automatic Date Date Chronometer helium escape valve at 10:00