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Quality Japanese-automatic movement; functions without a battery; powers automatically with the movement of your arm Antireflective-sapphire crystal Case diameter: 51 mm Two-tone-stainless-steel case; silver dial; date function Water-resistant to 984 feet (300 M) Get ready for undersea discovery with this classically styled, two-tone Invicta Grand Diver GT stainless steel men's automatic watch, which features a confidence-boosting water resistance to 300 meters (1000 feet). The large silver watch case is made from surgical grade stainless steel, and it's topped by a gold-plated unidirectional bezel with black elapsed time markings and gold-tone scalloped detailing. The silver dial offers Tritnite luminous dotted markers and dagger hands (with seconds hand) as well as a magnified date window at 3 o'clock. The handsome stainless steel bracelet band features a center link in gold tone, Invicta's diver helmet logo molded onto the solid end pieces, and a diver's buckle with safety clasp. Other features include an anti-reflective mineral crystal, 21-jewel automatic movement, and see-through case back. Pro Diver Collection Plunge into any horizon using the steadfast guidance of the Invicta Pro Diver. Stylishly classic, internal workings are forged with variations of either Swiss chronograph or 21-jewel automatic movements and willingly navigate in depths up to 300 meters. Built with confident prowess, the fortitude with which these timepieces function makes the Pro Diver the quintessential in performance. Screw Down Crowns: Many Invicta watches are equipped with a screw down crown to help prevent water infiltration. This is most common on our Diver models. In order to adjust the date and/or time on such a watch, you must first unscrew the crown before you can gently pull it out to its first or second click stop position. To do this, simply rotate the crown counterclockwise until it springs open. When you have finished setting the watch, the crown must then be pushed in and screwed back in tightly. Not doing so will cancel the water resistance of the watch and will void all warranties from the manufacturer. Overall, this process should not require a lot of effort or force. Automatic Watches Automatic watches donot operate on batteries. Automatic watches are made up of about 130 or more parts that work together to tell time. Automatic movements mark the passage of time by a series of gear mechanisms, and are wound by the movement of your wrist as you wear it. The gear train then transmits the power to the escapement, which distributes the impulses, turning the balance wheel. The balance wheel is the time regulating organ of a mechanical watch, which vibrates on a spiral hairspring. Lengthening or shortening the balance spring makes the balance wheel go faster or slower to advance or retard the watch. The travel of the balance wheel from one extreme to the other and back again is called oscillation. Lastly, automatic movements come in different types, including movements that are Swiss-made, Japanese-made, and more. Also referred to as self-winding, watches with automatic movements utilize kinetic energy, the swinging of your arm, to provide energy to an oscillating rotor to keep the watch ticking. They're considered more satisfying to watch collectors (horologists) because of the engineering artistry that goes into the hundreds of parts that make up the movement. If you do not wear an automatic watch consistently (for about 8 to 12 hours a day), you can keep the watch powered with a watch winder (a great gift for collectors).