Using this watch is very simple. Just adjust the time through the onion crown according to your local time. When wearing, fasten the stainless - steel buckle securely. As for care, avoid hitting the watch against hard objects to prevent damage to the case or the glass mirror. Although it's waterproof up to 10m, don't wear it for long - term underwater activities like diving. Wipe the watch with a soft cloth regularly to keep it clean and shiny. If there's any problem with the timekeeping or other functions, it's best to take it to a professional watch repair shop.