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2. Heat detector - Wikipedia

   en.wikipedia.org/wiki/Heat_detector

   A heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the element regulate the rate flow of heat into the element. All heat detectors have this thermal lag. Heat detectors have two main classifications of ...

3. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary ( theft) or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.

4. Passive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/Passive_infrared_sensor

   A passive infrared sensor ( PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors. PIR sensors are commonly used in security alarms and automatic lighting applications. PIR sensors detect general movement, but do not give ...

5. Guardian Alarm - Wikipedia

   en.wikipedia.org/wiki/Guardian_Alarm

   Founded in 1930, Guardian Alarm is the largest independently owned security company in the Midwest and continues to be ranked in the top 20 in the United States. The company has over 500 employees in various cities across the United States. Guardian Alarm installs, monitors, and services home and business security systems.

6. Home guard - Wikipedia

   en.wikipedia.org/wiki/Home_guard

   Home guard is a title given to various military organizations at various times, with the implication of an emergency or reserve force raised for local defense. The term "home guard" was first officially used in the American Civil War, starting with units formed by German immigrants in Missouri, and may derive from possible historical use of the ...

7. Home Guard (United Kingdom) - Wikipedia

   en.wikipedia.org/wiki/Home_Guard_(United_Kingdom)

   The Home Guard (initially Local Defence Volunteers or LDV) was an armed citizen militia supporting the British Army during the Second World War.Operational from 1940 to 1944, the Home Guard had 1.5 million local volunteers otherwise ineligible for military service, such as those who were too young or too old to join the regular armed services (regular military service was restricted to those ...