Sirens and Strobes
When an intruder alarm is tripped, the alarms siren will not only alert you to the intruder, but intimidate them away. Security alarm sirens are usually mounted on an interior wall, but some are designed for exterior use to alert the neighbors as well. Some sirens have accompanying strobe lights to alert occupants and neighbors of a security intrusion. Typically, they are mounted at a height or area that is not accessible to the intruder.