A combined alarm device (sounder / beacon) is mounted centrally and clearly visible in the room to be protected and will be activated when the alarm value(s) is exceeded by providing a clear audible acoustic alarm and flashing beacon.
A beacon is mounted near entrance doors and will provide a clear, visible signal for an unsafe situation in the area to be entered.
A signal tower can be mounted at different locations.
With a normal operating system the green light is on.