KS Imperial Men's Automatic Mechanical Date Day Black Leather Band Wrist Watch KS245 Kronen&Shne Mens Watch, Imperial series Day, date, 24hour display Crystal case back Water resistant up to 3 ATM (Not suitable for swimming, diving, shower etc.) 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.