What is the rope on the shoulder of the Hong Kong police?

The rope on the shoulder of the Hong Kong police is used to prevent the siren from being lost. According to relevant public information, the siren is placed in the upper left pocket of the police uniform and fixed with a rope. The rope gradually formed the ribbon culture of the Hong Kong Police Force, and sounded the police whistle to call for reinforcements. In order to prevent the sentry from getting lost, there will be a rope to fix the sentry.