Sonnerie refers to a sophisticated complication in horology that involves the striking mechanism of a watch, typically found in high-end timepieces. This feature allows the watch to audibly chime the hours and often the quarters, similar to a clock tower. There are two main types of sonnerie: grande sonnerie and petite sonnerie. A grande sonnerie strikes the hours and quarters automatically, while a petite sonnerie strikes the hours and quarters only when activated by the wearer.

The sonnerie mechanism is a testament to the watchmaker's skill, as it requires intricate engineering to fit the complex system of gongs and hammers within the limited space of a watch case. This complication not only enhances the functionality of the watch but also adds an element of auditory beauty, making it highly sought after by collectors and enthusiasts.

In addition to its technical complexity, the sonnerie is appreciated for its historical significance, as it harks back to a time when audible timekeeping was essential in the absence of electric lighting. Modern sonnerie watches often incorporate advanced materials and technology to improve sound quality and reliability, while still honoring the traditional craftsmanship that defines this prestigious horological feature.