Ks Aviator Day Date Automatic Mechanical Men's Silver Gold Stainless Steel Wrist Watch KS160 Designed by renowned German Watch Maker Mr. Ludwig van der Waals. He won numerous awards in many recognized creative design competitions around the world Precision Movement with the latest breakthrough "Kronen&Shne" Patented Mechanical Technology. Day date and 24 hours display Cal. KM0206 automatic mechanical movement inside Please note this is a MECHANICAL WATCH which will stop working if you are not moving for a long time. Please wind up the watch before EVERY USAGE, and keep the watch away from magnets to ensure the watch keeps working. For detail instructions of the watch, you can access our Kronen & Shne official website to download. If any questions, dont hesitate to contact us.