To use this watch, simply set the time according to your local time zone. Make sure the crown is properly pushed in after setting to prevent water from entering. Avoid exposing the watch to extreme temperatures, as this may affect its performance. When cleaning, use a soft, dry cloth to gently wipe the watch. Do not use abrasive materials as they can scratch the surface. For long - term storage, keep it in a cool, dry place and away from direct sunlight.