As electronic personal care products, hair trimmers must meet strict safety standards. For the US market, UL or ETL certification and FCC compliance are required. For the EU, look for CE marking, RoHS (Restriction of Hazardous Substances), and GS certification. If the product is marketed as waterproof, verify the IPX rating (e.g., IPX7 for full immersion or IPX5 for water resistance). Ensure the supplier provides MSDS (Material Safety Data Sheet) for the integrated lithium batteries to facilitate smooth international shipping.