KS Navigator Men's Analog Mechanical Automatic Calender 24hours Leather Wrist Watch KS281 Present by Kronen&Shne group, Navigator series. Crystal case back. Date day and 24hours 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.