The optional Warning Signs connect to the SoundAlert using the cable supplied. The Warning Sign also plugs into the AC power using the adapter that is provided along with a long power extension lead (low voltage). The time that the noise sign lights up can be set to between 5 seconds and 10 minutes after the noise levels fall again.
Note: These warning signs cannot be used alone, they must be connected to a SoundAlert unit.
All signs can be set to give either a constant light or can flash to attract attention when the measured sound levels are high.