Swiss Army Professional Ground Force Men's Watch

Rugged men's watch features a stainless steel and titanium case Elegant timepiece has a protected screw-down Crown Watch has a black dial and luminous hands Arabic numerals Date window at 3 o'clock Scratch resistant sapphire crystal Stainless steel and titanium bracelet Double-locking safety clasp with diver extension Swiss automatic mechanical movement Water resistant to 100 Meters (10 ATM, 330 feet) Case Dimensions: 41 mm in Diameter 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. 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 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.