Fire trucks are an important part of public safety. When fire trucks are driving on the road, we often hear very loud sounds. Firefighters rely on sirens and speakers to alert the public and communicate with each other.

Siren and speaker are used together. Siren has various tones and is connected with speaker to produce loud and high-pitched sounds. Commonly used tones include manual, wail, yelp, hi-lo, horn, and radio. Fire departments often use a combination of sirens and loudspeakers to alert the public to emergencies. Remind vehicles and pedestrians on the road to avoid fire trucks in time. At the same time, it can also play a role in evacuating people and giving emergency reminders at fire scenes.

In addition to sirens and speaker systems, fire trucks will also be equipped with long rows of lights and perimeter lights.
The regular colors are a combination of red and white, which vary from country to country. The siren and speaker are used to stimulate hearing, and the warning light is used to stimulate vision. They are used in conjunction with each other.