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2. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   The rechargeable batteries were often replaced by a pair of AA batteries along with a plastic shell encasing the detector. The photoelectric (optical) smoke detector was invented by Donald Steele and Robert Emmark from Electro Signal Lab and patented in 1972. [15] In 1995, the 10-year-lithium-battery-powered smoke alarm was introduced. [10]

3. Fire alarm system - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_system

   The batteries can be either inside the bottom of the panel or inside a separate battery box installed near the panel. Initiating devices: These components act as inputs to the fire alarm control unit and are manually or automatically activated. Examples include pull stations, heat detectors, duct detectors, and smoke detectors.

4. Gentex (automotive supplier) - Wikipedia

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

   They produce dimmable aircraft windows for the commercial, business and general aviation markets. In addition, the company produces photoelectric smoke detectors, signaling devices, and the HomeLink Wireless Control System for the North American fire protection market. [4] Founded in 1974, Gentex Corporation is based in Zeeland, Michigan.

5. First Alert - Wikipedia

   en.wikipedia.org/wiki/First_Alert

   On September 4, 1992, BRK recalled all hardwired smoke alarms under the series 1839I and 2839I due to testing programs determining that corrosion could form on the alarm horn's electrical contacts, causing the piezo to fail to make any noise. [6] In May 2006, First Alert combination smoke alarms were recalled due to draining batteries rapidly. [7]

6. 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 ...

7. Fire alarm notification appliance - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_notification...

   A fire alarm notification appliance is an active fire protection component of a fire alarm system. A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action. Audible appliances have been in use longer than any other method of notification.