Cordless electric shavers with lithium-ion batteries are subject to DOT/IATA/IMDG hazardous materials regulations governing lithium battery transport. Air shipments must comply with IATA Dangerous Goods Regulations (Section II or Section IA depending on watt-hour rating), and ocean shipments follow IMDG Code requirements. Importers should confirm battery watt-hour ratings and ensure packaging and documentation meet the applicable transport standard before booking freight.

For Section 301 tariff purposes, country of origin is determined by the 'substantial transformation' test: the country where the article last underwent a fundamental change in character or use. Assembly of a shaver from Chinese-origin components in a third country may or may not constitute substantial transformation depending on the complexity of the operations performed. CBP has issued rulings on similar consumer electronics; importers considering third-country assembly to mitigate Section 301 exposure should obtain a binding origin ruling before restructuring their supply chain.