About this Product (vendor description)

*Khaki Navy Frogman wristwatch by Hamilton is all about stand-out sophistication *Sturdy rubber craftsmanship adds rugged reliability to this men's watch *Sophisticated timepiece features a silver dial with black Arabic numerals *Luminescent hands *Chronograph function with 12 hour, 30 minute and date registers *Polished and brushed titanium case *Screw-down crown protects *Screw-in sapphire crystal see-thru caseback *Black rubber strap with white contrast stitching and pin buckle *Swiss-made mechanical automatic self-winding movement *Scratch-resistant sapphire crystal *Water resistant to 200 meters/660 feet *Case dimensions: 42 mm wide x 53 mm long x 16 mm thick *Bracelet dimensions: 22 mm wide x 9 inches long All measurements are approximate and may vary slightly from the listed dimensions.Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists.This watch has a screw-down crown (knob) for setting the time. Screw-down crowns create a stronger seal against the case than a push-and-pull knob, giving the watch a greater water resistance factor. To unscrew the crown, grasp the knob and turn it counter-clockwise (towards you) a number of times until it releases. Then pull or push the crown into position to set the time, date, and other functions. To close the crown, press it against the case while turning in a clockwise direction.This watch is powered by automatic movement which means the winding of the spring occurs automatically when the wearer moves his/her arm. However, it is recommended that you manually wind the watch at least once every two weeks. It is also important to adjust the time once a month as automatic movement can gain or lose a few minutes per month.