Sirens and buzzers are mechanical, electronic, or piezoelectric audial warning devices.
Sirens and buzzers are used to warn against fire or other hazards that require evacuation, a machine or equipment fault, and security issues, such as an external fire escape door being opened from the outside.
They can be and are often attached to a wider alarm system, such as smoke detectors or switchboards.
The new generation of sirens and buzzers come with different signal types and sound outputs. Depending on the application area sirens may be combined with flashing or permanent light sources.

The sound level of sirens and buzzers must be adjusted according to the environment.

Ileritraffic offers a wide variety of sirens- from single-tone buzzers to multipurpose sirens with 43 tones.