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2. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   Smoke detector mounted on a ceiling Knowing this sound could save your life - it means replace the battery. A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors/Alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres ...

3. Did you remember to change smoke, carbon monoxide detector ...

   www.aol.com/did-remember-change-smoke-carbon...

   In addition to changing the battery periodically, they recommend testing alarms monthly. Meanwhile, carbon monoxide poisoning also remains a concern for officials.

4. Here's Everything You Need to Know About Smoke Alarms - AOL

   www.aol.com/heres-everything-know-smoke-alarms...

   Some states (like California) require battery powered smoke alarms that last up to 10 years. The batteries in these are inaccessibly sealed, and the beeping means it's time to replace the whole ...

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

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

   That means the battery needs to be changed. Replace smoke detectors at least every 10 years: Don't place your life in the hands of an outdated smoke alarm.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 ...

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   This battery, introduced in 1901, was very common in continental Europe until the 1970s. It usually contains three B cells in series. In Switzerland as of 2008, 4.5-volt batteries account for only 1% of primary battery sales. [89] PP3, 9-volt, or E [90] Radio battery Smoke alarm battery Square battery Transistor battery 006P MN1604

7. Fire alarm system - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_system

   Fire alarm systems are required in most commercial buildings. They may include smoke detectors, heat detectors, and manual fire alarm activation devices (pull stations). All components of a fire alarm system are connected to a fire alarm control panel. Fire alarm control panels are usually found in an electrical or panel room.