9109.10 - Electrically operated:

This category, HTS Code 9109.10, specifically encompasses electrically operated complete and assembled clock movements. These are the self-contained mechanisms that power and regulate timekeeping for clocks, driven by an electric current rather than a wound spring or pendulum. Such movements are distinguished by their reliance on an electrical power source, such as a battery or mains electricity, to operate.

The key differentiator for this category lies in its "electrically operated" nature. Its sibling category, 9109.90 ("Other"), would cover clock movements that are not electrically operated, such as those powered by mechanical means (e.g., spring-driven or weight-driven movements). Therefore, the presence or absence of an electric power source is the primary criterion for distinguishing between these two classifications at this level.

Under this classification, further subcategories exist to refine the classification based on the intended application of the electrically operated movement. These subdivisions, ": Of alarm clocks:" and ": Other:", allow for the specific identification of movements designed for alarm clock functionality versus those intended for other types of clocks. This granular breakdown aids in precisely cataloging diverse clock movement types within the broader scope of electrically powered mechanisms.