<br><br><b>Specifications</b><br>Crystal:Sapphire<br>Case Material:Stainless Steel<br>Band Material:Genuine Leather<br>Band Width:22.00mm<br>Case Diameter:44.00mm<br>Water Resistance Depth:100M <br><br><b>Automatic Watches</b><br> Automatic watches do not operate on batteries. Automatic watches are made up of about 130 or more parts that work together to tell time. Automatic movements also referred to as self-winding, watches with automatic movements utilize kinetic energy, the swinging of your arm, to provide energy to an oscillating rotor to keep the watch ticking. They're considered more satisfying to watch collectors (horologists) because of the engineering artistry that goes into the hundreds of parts that make up the movement. If you do not wear an automatic watch consistently (for about 8 to 12 hours a day), you can keep the watch powered with hand-winding. A solemn statement about the strap: The band is made of one piece of full cow leather with beautiful natural skin texture, namely vegetable tanned leather，it does not add any chemical things,egetable tanned leather is so ex pensive that it is very rare in watch band. It's carefully selected by our designers. It is very durable and will not be damaged and can be used for all time.