As its name suggests, the Solar watch works thanks to the energy of the sun. Solar watches use a thin quartz plate to operate. Traditionally, the latter is made to oscillate by the impulse of an electric battery, but in the case of a solar watch, the impulse given to this quartz plate comes not from the battery but from a battery whose energy comes from solar radiation. Unlike the automatic watch or at the quartz watch, Photovoltaic sensors are installed on the dial of solar watches to capture this energy and convert it into electrical energy which is then stored in a battery so that the watch runs continuously. The accuracy of a solar watch is similar to that of a quartz watch namely a difference of a few seconds per month but the advantage of this watch is that the battery never needs to be changed.