Using your Tissot Desir watch is easy. Just put it on your wrist and it'll start showing the time right away. When the battery is about to die, the watch will let you know. To keep it in good shape, avoid hitting it against hard objects as the sapphire crystal, though scratch - resistant, can still be damaged. Clean it regularly with a soft, dry cloth. If you need to replace the battery, it's best to take it to a professional watchmaker. This way, your watch will accompany you for many years to come.