43 mm case, open, readable dial, sapphire crystal, quality Swiss automatic movement, up to 80 hours of power reserve and an indicator on the dial to show how much power is left before the next winding. The DiaMaster Power Reserve really does have it all. Product details: Movement: Automatic Band: Leather Case: 43mm, Ceramic Crystal: Sapphire Water resistance: 30m Additional functions: Date, 3 Hand Warranty: 2 years Limited Manufacturer Warranty