9105.91 - Electrically operated:

This HTS category, 9105.91, encompasses "Other clocks" that are electrically operated and do not fall under more specific classifications within heading 9105. These are essentially alarm clocks, bedside clocks, mantel clocks, and similar timekeeping devices that are powered by electricity, excluding those specifically designed for wall mounting or as parts of other machines. The key distinguishing feature here is the electrical operation.

Within the broader category of "Other clocks" (9105), this subheading 9105.91 specifically addresses electrically operated models that are not otherwise specified. It is distinguished from its sibling category, 9105.99, which covers "Other" clocks that are *not* electrically operated, meaning they are likely mechanical or battery-powered in a way not specifically enumerated. This means that if an electrically powered clock is not a travel alarm clock, a wall clock, or a clock incorporating a timepiece mechanism in a motor vehicle, it will likely fall under 9105.91.

The subcategories under 9105.91 further refine the classification based on the type of display. 9105.91.40 specifically covers clocks with an opto-electronic display, such as LED or LCD screens, which present the time through illuminated digital segments. In contrast, 9105.91.80 captures all other electrically operated "other clocks" not possessing an opto-electronic display, implying they would use more traditional analog or mechanical displays, even though they are electrically powered.