Automatic watches are powered by the movement of the hand. In this timepiece, the daily movements of the wearer allow the rotor to start itself. To make this possible, the rotor is in close contact with the body of the watch, giving it constant energy to run through oscillations and circular motions, which in turn help the watch's mainspring to wind.
Solar-powered clocks are charged by light (even emitted from an artificial source) and continue to run in total darkness for months. These are quartz watches that also use a quartz crystal to tell the time. The main difference is the presence of a solar panel under the dial or front of the watch. This panel receives light from the environment.
Quartz watches are powered by replaceable batteries. They are popular because they are extremely accurate. Their batteries need to be replaced every few years. These watches work by transmitting electricity through a specially shaped quartz crystal. It oscillates at a constant high speed and is responsible for the operation of the hands measuring the hours, minutes and seconds.
Chronograph type watches are equipped with a more complex mechanism, allowing them to work in addition to a normal analog watch and as a stopwatch.
Most chronograph watches are equipped with two additional buttons located at 2 o'clock and 4 o'clock.
The button located at two o'clock serves to start and stop the chronometer, and on some models that can measure and store intermediate times, each time you press this button, you read the corresponding intermediate time.