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2. These Are the Best Emergency Radios to Keep You Updated ...

   www.aol.com/best-emergency-radios-keep-updated...

   Rather, think of it like a smoke detector alarm or CO2 detector, albeit a unit that relies on AC power with a battery backup. ... Power options include an AC adapter, a rechargeable battery, AAA ...

3. First Alert - Wikipedia

   en.wikipedia.org/wiki/First_Alert

   The three-man team (Burke-Roberts-Kimberlin) invented the first battery-powered smoke detector [3] [4] 1964- Began commercial manufacturing of the first battery-powered smoke detector; 1967- Pittway began manufacturing the alarms; 1974-Sears begins selling the BRK model SS-74R battery powered smoke alarm; 1992-Sold to T.H. Lee & Associates

4. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   Smoke detector mounted on a ceiling. 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 (1 in) thick, but shape and size vary.

5. Nine-volt battery - Wikipedia

   en.wikipedia.org/wiki/Nine-volt_battery

   The nine-volt battery, or 9-volt battery, is an electric battery that supplies a nominal voltage of 9 volts. Actual voltage measures 7.2 to 9.6 volts, depending on battery chemistry. Batteries of various sizes and capacities are manufactured; a very common size is known as PP3, introduced for early transistor radios. The PP3 has a rectangular ...

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

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

   Daylight saving time ended on Sunday. If you forgot to replace your smoke and carbon monoxide detector batteries, why not replace them today?

7. Zinc–carbon battery - Wikipedia

   en.wikipedia.org/wiki/Zinc–carbon_battery

   Zinc–carbon batteries have a lower per unit cost and are often used as power for appliances that consume little energy, like remote controls for television, clocks, and smoke detectors. Zinc-carbon batteries were in common use with hand-cranked telephone magneto phones, powering the microphone and speaker.