The Chronograph complication measures the duration of time over which an activity occurs. This occurs without interfering with the timekeeping function of the watch. Chronograph Watches have two or three sub dials that display the Seconds, Minutes and Hours of the time lapsed. In addition, there are two pushers that start and stop the Chronograph function. These are usually located above and below the watch Crown. Furthermore, the Chronograph often has a Tachymetre printed on the outer edge of the watch dial. Chronograph Watches are among the most desirable of watch designs. Many watch styles incorporate the complication from elegant dress watches to sporty dive watches.