Using this watch is a breeze. Simply set the time in your local time zone and the second time zone as needed. The stopwatch and chronograph functions can be accessed via the side buttons. For the calendar, it will automatically adjust. When it comes to maintenance, keep it away from strong magnetic fields and extreme temperatures. Wipe the watch regularly with a soft cloth to keep it clean. Avoid exposing it to water beyond its 3-bar water resistance limit. For the leather band, keep it dry to prevent damage. Enjoy your stylish and functional watch!