Rolex Yacht-Master II Men's Watch 44mm White Dial Oyster Steel represents the top echelon of Rolex watchmaking technology. The model builds upon the design of the original regatta timer (known simply as the Yacht-Master) by including a synchronized race countdown. The Ring Command bezel operates in conjunction with the movement, gaining the wearer access to all the caliber 4161's innovative processes, such as a programmable countdown, mechanical memory, and on-the-fly synchronization.