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First Alert

First Alert SA320FF Dual-Sensor Smoke and Fire Alarm, Battery Powered, Frustration-Free Packaging, White , 1 Pack

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Size: 1-Pack


Style: Standard Detection


Pattern Name: SA320FF


Features

  • Help keep your family safe with this battery operated smoke alarm; It requires no rewiring for installation and provides continuous monitoring even if there's a power failure
  • Equipped with both a photoelectric and ionization sensor to quickly detect both fast burning, and smoldering fires
  • Single test/silence button lets you easily check alarm function and mute false alarms; Use Polaroid AA batteries for best results
  • Loud 85 decibel siren sounds to alert you to danger
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert brand trust survey in February 2018)

Description

While all smoke alarms are designed to detect smoke, different sensing technologies react differently to certain types of fires. This alarm makes use of both ionization and photoelectric sensors to offer the earliest possible warning regardless of the type of fire. Sometimes a fire can smolder for hours before erupting into flames. Photoelectric Sensing Technology is more sensitive than Ionization Sensing Technology at detecting these sorts of smoldering fires, like those caused by cigarettes burning in couches or bedding. Other fires erupt into flames quickly, like kitchen grease fires or fires fueled by paper burning in a wastebasket. Ionization Sensing Technology is generally more sensitive than Photoelectric Sensing Technology at detecting these sorts of flaming fires.

Brand: First Alert


Style: Standard Detection


Power Source: Battery Powered


Color: White


Product Dimensions: 2"D x 5"W x 5"H


Item Weight: 11.2 ounces


Alarm: Audible


Sensor Type: Photoelectric


Global Trade Identification Number: 58


Number of Items: 1


Brand: ‎First Alert


Style: ‎Standard Detection


Power Source: ‎Battery Powered


Color: ‎White


Product Dimensions: ‎2"D x 5"W x 5"H


Item Weight: ‎11.2 ounces


Alarm: ‎Audible


Sensor Type: ‎Photoelectric


Global Trade Identification Number: ‎58


Number of Items: ‎1


Manufacturer: ‎First Alert


UPC: ‎029054015358


Part Number: ‎SA320CN


Country of Origin: ‎Mexico


Item model number: ‎SA320FF


Batteries: ‎2 AA batteries required. (included)


Is Discontinued By Manufacturer: ‎No


Size: ‎1-Pack


Pattern: ‎SA320FF


Item Package Quantity: ‎1


Number Of Pieces: ‎1


Certification: ‎not_applicable


Included Components: ‎First Alert Sa320Cn Dual Sensor Battery-Powered Smoke And Fire Alarm, 2-Aa Batteries


Batteries Included?: ‎Yes


Batteries Required?: ‎Yes


Battery Cell Type: ‎Zinc


Average Battery Life: ‎8760 Hours


Warranty Description: ‎10 Year Limited


Date First Available: December 8, 2012


Frequently asked questions

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This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Top Amazon Reviews

    • Easy to Install and Works Great
Size: 1-Pack Style: Precision Detection Pattern Name: SMI100
I needed a replacement for an old smoke alarm that stopped working, and this First Alert model was a perfect choice. Installation was quick and easy—I was even able to use the same screws from the previous unit, which made the whole process hassle-free. The alarm is compact, has a clean look, and the test and silence button is a nice feature for peace of mind. Battery-operated and ready to go right out of the box, it started working immediately after installation. Great value for a reliable, no-fuss smoke detector. Definitely recommend it if you're looking for a simple and effective replacement! ... show more
Reviewed in the United States on July 19, 2025 by Amanda
    • Reliable and cheap
Size: 2-Pack Style: Precision Detection Pattern Name: SMI100
Works exactly as advertised. I use these frequently across multiple properties. They're easy to install, very reliable, and cost-effective. Great value for the price. I highly recommend to anyone needing a simple and dependable solution.
Reviewed in the United States on July 23, 2025 by David
    • Great Value
Size: 1-Pack Style: Precision Detection Pattern Name: SMI100
This smoke detector is a great price, installs easily and works great!
Reviewed in the United States on July 3, 2025 by A Blaine Dockery
    • Sensitive
Size: 2-Pack Style: Precision Detection Pattern Name: SMI100
Works a little to well had to move the toaster it kept going off every I made toast
Reviewed in the United States on July 25, 2025 by Amazon Customer
    • This is a good product. First alert is always good.
Size: 1-Pack Style: Precision Detection Pattern Name: SMI100
Don’t put it next to a vaporizer. This is a very sensitive smoke alarm. I have a vaporizer in the bedroom and I hooked this up in the bedroom, but it seems like the vaporizer sets it off. But other than that, it’s good.
Reviewed in the United States on July 9, 2025 by Richard H.
    • Battery smoke alarms are not affected by power surges ,also easy installation .
Size: 1-Pack Style: Precision Detection Pattern Name: SMI100
I have used these exclusively in my home and they will alarm as advertised . They also give off warning beeps when the battery gets low on charge. Battery included with these smoke alarms. I have one wired smoke alarm but power surges have damaged the wired 120v unit in the past so the battery models are not affected by power surges . Batteries will last about 18 months . Most people die in house fires from smoke so smoke alarms are very cheap insurance to awaken you at the slightest hint of smoke giving you time to escape . ... show more
Reviewed in the United States on July 25, 2025 by Greg Sweeney
    • peace of mind
Size: 1-Pack Style: Precision Detection Pattern Name: SMI100
It was super easy to install, and the test/silence button is a convenient feature. The alarm is loud and clear exactly what you want in an emergency. Battery-powered means no wiring hassle, and it’s compact enough to fit seamlessly in any room. Reliable, straightforward, and great for home safety!
Reviewed in the United States on June 20, 2025 by Taylor Marsh
    • 9volt battery powered only.
Size: 1-Pack Style: Precision Detection Pattern Name: SMI100
Review Image by TruXterTechCom TruXterTechCom
Review Image by TruXterTechCom TruXterTechCom
Review Image by TruXterTechCom TruXterTechCom
If you found this because you searched for the 9120B, this is not for you. There is nothing to plug into for synchronized alarm. Only power source available is the 9volt. No backup, no secondary power source. The battery goes in quick but won't last very long. It is just a 9 volt and no dedicated power source. But it is easy to use. ... show more
Reviewed in the United States on June 25, 2025 by TruXterTechCom TruXterTechCom

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