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2. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   A photoelectric, or optical smoke detector, contains a source of infrared, visible, or ultraviolet light—typically an incandescent light bulb or light-emitting diode (LED)—a lens, and a photoelectric receiver—typically a photodiode. In spot-type detectors, all of these components are arranged inside a chamber where air, which may contain ...

3. Optical beam smoke detector - Wikipedia

   en.wikipedia.org/wiki/Optical_beam_smoke_detector

   An optical beam smoke detector is a device that uses a projected beam of light to detect smoke across large areas, [1] typically as an indicator of fire. [2] They are used to detect fires in buildings where standard point smoke detectors would either be uneconomical [3] or restricted for use by the height of the building. Optical beam smoke ...

4. Photoelectric sensor - Wikipedia

   en.wikipedia.org/wiki/Photoelectric_sensor

   Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are largely used in ...

5. 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.

6. Gentex (automotive supplier) - Wikipedia

   en.wikipedia.org/wiki/Gentex_(automotive_supplier)

   In the early 1990s, Gentex introduced a smoke detector equipped with a strobe light which is designed to alert deaf and hard of hearing individuals. [10] Gentex manufactures a wide range of photoelectric detectors for fire alarm systems, standalone, and interconnect systems.

7. How to reset a smoke alarm that won’t stop beeping - AOL

   www.aol.com/reset-smoke-alarm-won-t-205535790.html

   $19.99 at Amazon . If you have a hard time remembering to replace your smoke alarm’s battery each year, the Kidde Smoke Detector can help. Its 10-year lithium battery doesn’t need to be replaced.