1. Brand new men's automatic mechanical wrist watch. 2. Adjustable and comfortable black high grade leather strap watchband. 3. Day display at 3 o'clock position. 4. Mechanical & automatic movement. 5. Power by winding spring manually or self-winding 6. Mildly Water Resistant(Note: only resistant splash or drip, not suitable for shower, swimming and diving). Item size: Case diameter : Approx 3.2*4.0 cm Case Thickness : Approx 1.4 cm Band length : Approx 22.5 cm Band Width : Approx 1.8 cm Band adjustable : yes What you will get : 1x watch How to use mechanical watch? 1. When you first wear it, please wind the watch by turning the button on the side of the watch, until it is full. no need battery 2. By taking the button out slightly, you can adjust the time, then push back the button. 3. If you leave it still for a long time, please swing it lightly for a few minutes and wind-up by several laps. At this time, it will work normally. 4. If still have any questions, please contact us first. Hints and Tips: . Fully winded, the power reserve of watch can reach 36 hours. . If you wear it more than 10 hours per day,extra winding up will not be necessary.