The history of Seiko is a story of innovation. Thanks to a continuous steam of industry-leading innovations over the decades, the company established, and has maintained, its position as a world leader in the technology of time. The Astron collection has become an icon of high technology, energy efficient watchmaking and has proven GPS technology to be a remarkable global success. By connecting to the GPS network, the new Astron adjusts at the touch of a button to your time zone and, by taking all the energy it needs from light alone, never needs a battery change. It includes a bezel with city names of the world's major cities, this will let you know the approximate time of each city; and a GPS signal reception result indication. This model celebrates the 5th Anniversary of the Astron collection with 5 sapphires in the dial.