How does the police car make a sound?

According to the query of the TV network, the police car sounds through sirens, and the sirens of the police cars are very urgent, with no interval. The sirens of the police cars sound short, crisp and urgent, and the frequency like "whoa, whoa, whoa ~" is 2~3 times per second. Give people a warning and a sense of oppression against criminals. The fire alarm has the longest sound time, and it is more focused on the alarm sound "Woo-hoo, Woo-hoo", with a frequency of about three seconds. The voice is low, which makes people feel that the incident is serious and urgent.

Tips: Police cars can sound sirens when performing the following tasks:

(1) Rushing to the scene of criminal cases, public security cases, traffic accidents and other emergencies.

(2) Pursuing criminal suspects, fugitives and reeducation-through-labor personnel.

(3) Chasing the hit-and-run vehicles and personnel.

(4) escorting criminal suspects, criminals and reeducation-through-labor personnel.

(5) to perform security, vigilance and public order, traffic patrol and other tasks.