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2. Motion detector - Wikipedia

   en.wikipedia.org/wiki/Motion_detector

   A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

3. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Local alarms do not include monitoring, but may include indoor and/or outdoor sounders, such as motorized bells or electronic sirens and lights, such strobe lights which may be useful for signaling an evacuation notice during fire emergencies, or to scare off an amateur burglar quickly. However, with the widespread use of alarm systems ...

4. Security lighting - Wikipedia

   en.wikipedia.org/wiki/Security_lighting

   Security lighting to prevent intrusions may be counter-productive. Turning off lights halved the number of thefts and burglary in Övertorneå Sweden. [2] [3] A test in West Sussex UK showed that adding all-night lighting in some areas made people there feel safer, although crime rates increased 55% in those areas compared to control areas and to the county as a whole.

5. Hear an outdoor emergency siren in the county? Here's ... - AOL

   www.aol.com/hear-outdoor-emergency-siren-county...

   The outdoor weather siren system in St. Joseph County is in need of new electronics and an upgrade, and officials hope the work is done by early fall.

6. Alarm device - Wikipedia

   en.wikipedia.org/wiki/Alarm_device

   civil defense siren, also known as tornado sirens or air raid sirens; fire alarm systems. fire alarm notification appliance "Multiple-alarm fire", a locally specific measure of the severity of a fire and the fire-department reaction required. smoke detector; car alarms; autodialer alarm, also known as community alarm; personal alarm

7. ATI HPSS - Wikipedia

   en.wikipedia.org/wiki/ATI_HPSS

   San Francisco, California - This system is unique featuring the sound of the decommissioned Federal Signal STL-10 sirens that the HPSS units replaced; Casitas Dam, Ventura, California - This system is unique as they look like the Federal Signal Directional Speaker Array (DSA) sirens, but can have 7–8 speakers per stack, and gray caps on the speaker cones.