Amazon.comFrom the master craftsmen at Seiko, the Seiko Mens SNKL23 Seiko 5 Automatic Black Dial Stainless Steel Bracelet Watch is a cuttingedge timepiece with a masculine appeal. Featuring a black analog dial and a silver stainless steel band, this watch is packed with style and would be a great addition to your watch collection.This is an automatic mechanical watch. Automatic watches do not operate on batteries; instead, they are powered automatically by the movement of the wearers arm. If the main spring in your automatic watch is not wound sufficiently, timekeeping may become less accurate. In order to maintain accuracy, wear the watch for 8 hours or more per day, or manually wind the main spring by turning the crown. When not in use, automatic watches may be kept charged with an automatic watch winder a watch storage unit which may be purchased separately.The Seiko StoryFrom Humble beginnings, Kintaro Hattoris Vision for Seiko has become reality. A consuming passion for excellence imprinted in our Corporate DNA passed from generation to generation. Seiko, for 125 years committed to the art and science of time.A culture of innovation connects a 19th century Tokyo clock shop with 20th century advances in timekeeping to an extraordinary 21st century quiet revolution. Continually driven by dedication and passion, established a multitude of worlds first technologies? transforming the principles of timekeeping.The first quartz wristwatch changed the history of time.The first Kinetic marked a new era in quartz watch technology.In 1969, Seiko Astron, the first quartz wristwatch was introduced.In an instant, Seiko exponentially improved the accuracy of wristwatches And Seiko technology firmly established todays standard in Olympic and sports timing.1984, another celebrated first Kinetic Technology powered by body movement.Kinetic a quartz mechanism with unparalleled accuracy the driving force behind more worlds firsts.Kinetic Chronograph the next generation of high performance timekeeping.Kinetic Auto Relay automatically resets to the correct time.Kinetic Perpetual combining the date perfect technology of perpetual calendar with the genius of Kinetic Auto Relay.And now Kinetic Direct Drive move, and the watch is powered automatically. Or hand wind it and see the power you are generating in real time.In the realm of fine watches, time is measured by Seiko innovation A heritage of dedication to the art and science of time.