Longines HydroConquest Divers Chronograph Watch

Men's timepiece with Swiss automatic movement Stainless steel watch case and bracelet Diver's watch with water resistance of 300 meters/ 1000 feet Blue dial, Arabic numerals Date at the 3 o'clock position Chronograph hours, minutes, and seconds Anti-reflective, scratch-resistant sapphire crystal Screw-down case back Screw-in crown Blue PVD rotating bezel Foldover clasp Case dimensions: 41 mm diameter x 16mm thick Bracelet dimensions: 21 mm wide x 9.5 inches long All measurements are approximate and may vary slightly from the listed information. Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists. Extra links are available through the manufacturer. (We do not provide this service.) 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. 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.