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2. ADT Inc. - Wikipedia

   en.wikipedia.org/wiki/ADT_Inc.

   ADT began to expand into new areas, such as fire alarms and security alarms, between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. ADT became a publicly traded company in the 1960s. [12] In 1964, ADT was found to be a monopoly in restraint of trade. It was shown to provide almost 80% of the central station alarm ...

3. The Best Place to Put Your Smoke Detector (Plus 3 Spots ... - AOL

   www.aol.com/best-place-put-smoke-detector...

   Replace smoke detectors at least every 10 years: Don't place your life in the hands of an outdated smoke alarm. For the most part, you can plan on replacing your smoke detector at least every 10 ...

4. EXPLAINER: Will burglar alarms still work after 3G shutdown?

   www.aol.com/finance/explainer-burglar-alarms...

   An alarm-industry lobbying group estimates that 1.5 million customers still need to upgrade their fire or burglar alarms, while about half a million have medical alert devices that run on 3G; it ...

5. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   Some smoke alarms use a combination of the 2; usually using a battery as an extra power source in the event of an outage. Commercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system. Usually, an individual commercial smoke detector unit does not issue an alarm; some, however, have built-in sounders.

6. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Ionization smoke alarms can quickly detect the small amounts of particles produced by fast-flaming fires, such as cooking fires or those fueled by paper or flammable liquids. A newer type of the smoke detector is the photoelectric smoke detector. It contains a light source, which is positioned indirectly to the light sensitive electric sensor.

7. Can ADT Secure a Win for Your Portfolio?

   www.aol.com/news/2013-03-09-can-adt-secure-a-win...

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