Invicta Men's 4840 Reserve Specialty Chronograph Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 52 mm 18k-rose-gold-plated-stainless-steel case; Black dial; Day-and-date functions; Chronograph functions Invicta Reserve 5-Year Warranty Included with Shipment