To ensure legal entry into international markets, watches must meet specific chemical and safety standards. For the European market, compliance with RoHS (Restriction of Hazardous Substances) and REACH is essential to ensure the materials (especially straps and plating) are free from lead, cadmium, and nickel. For the US market, ensure the products are lead-free and comply with California Proposition 65 if applicable. Additionally, CE marking is required for electronic components or smart-watch hybrids.