The mechanism that tells the time is called a movement or caliber. It is made up of many small parts such as gears, springs, and more. The movement is the heart of a watch that makes a watch beat and refers to the mechanism that drives the hands on the dial and enables complications such as a calendar, chronograph, or a second time zone. Different types of timepieces use different movements. There are three types of movements: 1. Quartz Movement - The movement makes the second hand move in single beats. It works on a small battery. 2. Mechanical Movement ? This movement makes the second hand move constantly. The mainspring of the watch must be wound by hand to work, usually every 2-3 days. 3. Automatic Movement - Kinetic energy from the movement of the wearer's wrist is automatically transferred to power the mainspring inside the watch.