One of a kind. The Rolex Sky Dweller is really here to help you keep track of time. It has an annual calendar as well as a dual time zone, so it’s a great choice for global travelers. With a bezel that rotates, you're able to set your own time zones and the date change is connected to your local time. The Rolex Sky Dweller runs on a calibre 9001, which is a self-winding mechanical movement. All in all, this is a highly recommended watch!