Using your Diesel DZ1965 Master Chief watch is a breeze. To set the time and date, simply pull out the crown on the side of the watch and turn it to adjust. For normal wear, it can handle splashes and brief submersion thanks to its 100m water resistance, but avoid wearing it during deep - sea diving. When it comes to maintenance, clean the watch regularly with a soft, dry cloth to keep it looking its best. If the watch stops working, it might be time to replace the battery. You can take it to a professional watch repair shop for battery replacement to ensure proper installation.