1. When you first wear this watch, you need to wind it to have a full power reserve. 2. How to wind it? Keep the crown on the normal position. → Turn the crown clockwise 30-40full turns. → Wear it at least 8 hours every day. 3. Suitable for daily use, can be kept on when washing hands, showering and bathing. Splash/rain resistant. Not suitable for swimming, snorkelling and water related work. 4. If the length of the strap is not suitable for your wrist size, there is an adjustment tool in the package. You can adjust the length according to the instructions. If it is not long enough, we can send you a longer strap.