Hainan Provincial Department of State Security
The Hainan Provincial Department of State Security (HSSD; Chinese: 海南省国家安全厅) is a provincial department of the Chinese Ministry of State Security responsible for national security and secret policing in the contiguous island province of Hainan, headquartered in Haikou. Members of the Hainan SSD have badge numbers with prefixes beginning with "46xxxx".
Source: Wikipedia — Hainan Provincial Department of State Security (CC BY-SA 4.0)