海关说明信 Customs Letter

携带一份双语海关说明信，有助于在中国海关、安检或与本地 HAM 交流时说明设备用途。请打印后与 CRAC 批准文件一并随身携带。

Carrying a bilingual customs letter helps explain your equipment at Chinese customs/security checks. Print it and keep it with your CRAC approval.