The tariff schedule defines watch movements by reference to their dimensions and construction — specifically, movements with a smallest dimension not exceeding a defined measurement threshold (typically associated with wristwatch-scale mechanisms). Importers should obtain the movement's technical specifications, including its dimensions and jewel count, from the manufacturer to confirm whether the movement meets the watch-movement definition under the applicable HTS note.

It depends on whether the internal movement qualifies as a 'watch movement' by dimension. Many compact alarm clocks use watch-scale quartz movements and would fall here; larger alarm clocks with clock-scale movements would be classified under a different clock heading. The alarm function itself does not affect the classification — the movement type and size are determinative. When in doubt, importers should request a binding ruling from CBP.