Compliance is critical for cross-border trade. For the European market, ensure the product carries the CE, RoHS, and GS certifications. For the North American market, ETL or UL listing is mandatory for electrical safety. Technically, look for units with built-in ionizers for air purification and automatic water-level sensors to protect the pump from dry burning. If sourcing for dry climates, prioritize models with multi-speed settings and oscillating louvers to maximize air distribution efficiency.