Using your Diesel DZ4642 Mega Chief Chronograph is easy. The chronograph function allows you to time events. Simply press the buttons on the side of the watch to start, stop, and reset the timer. When it comes to water, this watch can handle up to 100 meters, so it's okay to wear it while swimming or snorkeling, but avoid high - pressure water like in a hot tub jet or diving with scuba gear. To keep your watch in top condition, wipe it with a soft, dry cloth regularly. If it gets wet, dry it thoroughly. And every few years, it's a good idea to have the watch serviced by a professional to ensure accurate timekeeping.