The heading splits battery-powered movements by how they show the time: 910811 covers those with a mechanical display (hands or rotating discs), 910812 covers those with an opto-electronic display only (such as LCD or LED), and 910819 catches remaining battery-powered types. Misidentifying the display mechanism is a common classification error, so verify the movement's display technology before entry.

Movements sourced from China may be subject to Section 301 tariffs depending on the specific tariff line. The applicable measure attaches to the 10-digit HTS line and the country of origin, so importers should check the current Section 301 annexes for the precise subheading before filing.