HP 18-5021 All-in-One Desktop PC - Manual (Page 34)

China safety notices
China: Altitude notice
Altitude warning for products not certified for use in >5000 m
仅适用于海拔 2000m 以下地区安全使用
– or –
仅适用于海拔 2000 米以下地区安全使用
China: Tropical warning notice
Tropical warning for products not certified for use in tropical regions.
仅适用于非热带气候条件下安全使用
Norway and Sweden: Cable grounding notice for products
with a TV tuner
CAUTION: To reduce potential safety issues, use a galvanic isolator when connecting to a cable
distribution system.
26 Chapter 3 Safety notices for notebook computers