Hamilton H77922141 Khaki Aviation X-Wind GMT Chrono Quartz 46mmCrosswind calculator, chronograph and now a second time zone: It takes a super sized 46mm stainless steel case to contain all the aviaton features the Hamilton designers have packed into this latest addition to the Khaki X-Wind collection. Adventure meets accuracy and makes a lasting impression, whether you're the captain of the craft or on board as a passenger.KHAKI AVIATIONThe Khaki Aviation collection perfectly displays Hamilton's technical know-how when it comes to creating reliable watches for pilots and urban aviators. QUARTZ WINDINGQuartz mechanisms are known for their accuracy, with only a one-minute variation annually. The battery sends an electric current to the crystal to keep time accurately.STAINLESS STEEL CASEA highly resistant alloy composed of steel and chromium. It can be worked to resemble a precious metal. It is nearly impervious to rust, tarnish, and corrosion. SAPPHIRE CRYSTALSynthetic sapphire crystal is a tough scratch-resistant material, only diamonds could leave a mark.WATER RESISTANCEYour timepiece is resistant up to 10 bar (100m) / 145 psi (328 ft).